Is a creature with 0 toughness sacrificed?

Yes, a creature with 0 or less toughness is put into the graveyard as a State-Based Action (SBA), which is a specific game rule; it doesn't technically get "sacrificed" (which is a player choice/cost) or "destroyed" (which involves damage/effects), but it does die and triggers "dies" effects, even if it's indestructible. This happens automatically when SBAs are checked, after spells/abilities resolve, preventing it from existing on the battlefield.
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What happens if a creature has 0 toughness?

When a creature has 0 or less toughness in Magic: The Gathering, it is immediately put into its owner's graveyard as a state-based action, regardless of being indestructible, because it cannot exist on the battlefield with non-positive toughness. This process is considered "dying," triggering death-related abilities, but it's not from damage or sacrifice, meaning indestructible or regeneration effects won't stop it unless the toughness is raised above zero first. 
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Does a creature with 0 toughness trigger death triggers?

Creatures die if they take lethal damage or have their toughness reduced to 0 or less, as a State-based action. Planeswalker die if they have no loyalty counters on them. Both of them die if they get destroyed, or any other effect or spell that make them go from the battlefield to the graveyard, such as Sacrifice.
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Can you regenerate a creature with 0 toughness?

Regenerate works when a creature is dealt lethal damage or destroyed. When a creature's toughness is reduced to 0 like in this case, it is neither dealt lethal damage nor destroyed. It simply dies because its toughness is 0 or less. So the answer is that regenerate won't even "do its thing".
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Does sacrifice get rid of indestructible?

Yes, sacrificing an indestructible permanent in games like Magic: The Gathering does send it to the graveyard because "indestructible" only prevents death from lethal damage or effects that explicitly say "destroy," not from being sacrificed, exiled, bounced, or having toughness reduced to zero. Sacrificing bypasses the "destroy" mechanic, sending the permanent to the graveyard as a different type of removal.
 
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Let’s Bring Back Sacrifice

Does sacrificing a creature count as it being destroyed?

Sacrificing a permanent doesn't destroy it, so regeneration or other effects that replace destruction can't affect this action.
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Can indestructible be killed in combat?

No, an indestructible creature cannot die from normal combat damage because "indestructible" prevents destruction from damage or "destroy" effects, but it can die from other things like -X/-X counters reducing toughness to 0, exile, being returned to hand/deck, or forced sacrifice (Edict effects). The damage still gets marked, but the creature ignores lethal damage and stays on the battlefield with that damage until the turn ends. 
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What does "regenerate" mean in MTG?

Regeneration is a replacement effect which means: "The next time this permanent would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat."
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Does a creature with 0 power still deal combat damage?

No, a creature with 0 power (or less) does not deal combat damage in Magic: The Gathering, even if it's attacking or blocking; the rules state creatures that would assign 0 or less damage assign no damage at all, which also means abilities triggering "when [it] deals damage" won't trigger. They can still attack or block, but they won't cause life loss or trigger "damage dealt" effects unless modified by other effects like +1/+1 counters or abilities that change how damage is assigned.
 
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Does a creature with 0 toughness enter the battlefield?

Toughness is the number printed after the slash at the bottom right corner of a creature. It is the amount of damage needed to destroy it. If the number becomes equal to or less than 0 at any time, it is put into its owner's graveyard as a state-based action.
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Is land a permanent MtG?

Yes, in Magic: The Gathering, lands are a fundamental type of permanent, just like creatures, artifacts, enchantments, and planeswalkers; a permanent is anything that stays on the battlefield after being played, while instants and sorceries do not. Lands are crucial because they remain on the field indefinitely (until removed) and are the primary source of mana for casting spells, making them essential to the game's flow. 
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Can I sacrifice a creature in response to it being destroyed?

If a creature is currently being destroyed, then no. However, if your opponent, say, casts Doom Blade on your ornithopter, then you can sacrifice it before the Doom Blade resolves. Just make sure to say you're responding to the effect that would destroy the artifact/artifact creature before it resolves.
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Does exiling count as dying?

No, in games like Magic: The Gathering, exiling a creature does not count as it dying; "dying" specifically means going from the battlefield to the graveyard, while exiling sends a card to a different zone (the exile zone) and bypasses death triggers. If an effect replaces dying with exile (like "exile it instead"), the creature never technically "died," so death effects don't trigger, though leaving the battlefield might. 
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Can a creature with 0 power have Deathtouch?

No, deathtouch does not work with 0 power in Magic: The Gathering because the creature must deal at least 1 damage for deathtouch's effect to trigger, and a 0-power creature deals no damage at all, making it useless for killing other creatures via deathtouch unless its power is increased. Effects that reduce power to 0, like [[Hydrosurge]], effectively nullify deathtouch. 
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What is the rule 609.7 in Magic: The Gathering?

609.7a If an effect requires a player to choose a source of damage, they may choose a permanent; a spell on the stack (including a permanent spell); any object referred to by an object on the stack, by a replacement or prevention effect that's waiting to apply, or by a delayed triggered ability that's waiting to ...
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Does preventing damage stop destroying?

Yes, preventing all damage stops destruction if the destruction is caused by damage; however, "destroy" and "damage" are different mechanics, so "prevent all damage" does not stop effects that specifically say "destroy," exile, sacrifice, or reduce toughness to zero (like from -1/-1 counters), as these bypass damage prevention entirely. Think of it like this: damage prevention stops wounds, while "destroy" is a different way of removing something, often without causing a wound first. 
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What happens when a creature reaches 0 toughness in MTG?

Any creature whose toughness becomes zero will be sent to the graveyard during SBA checks.
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Does 0 still count as combat damage?

No, dealing 0 damage in <<!Magic: The Gathering (MTG)>> or similar games does not count as dealing combat damage; it's treated as if no damage was dealt at all, so abilities triggering on damage being dealt won't activate, even if an attack occurred. While an attack happens and a creature might assign combat damage, if that amount is zero (due to low power or damage prevention), the game rules treat it as a non-event for damage-triggered effects. 
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Can you sacrifice a creature after it deals combat damage?

Yes, you can sacrifice a creature after it deals combat damage but before the End of Combat step finishes, using instant-speed effects or abilities like {!nav}Ashnod's Altar{/nav} or {!nav}Phyrexian Altar{/nav}, or even to respond to triggered abilities that might destroy it, but not if it's already dead from lethal damage; the key is having priority in the Combat Damage Step or End of Combat Step to use a sacrifice outlet. This allows you to get benefits (like mana or drawing a card) from its death while it still counts as an attacker/blocker that dealt damage, often preventing it from dying to -1/-1 counters or damage effects if it's still alive. 
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Does regenerate stop sacrificing?

The first is that regeneration does not protect against being sacrificed, only against being destroyed (such as by combat damage, or noncombat damage like Grim Lavamancer, or destroy spells like Day of Judgment or Doom Blade).
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Can you regenerate a creature if it is already tapped?

Yes, you absolutely can regenerate a creature that is already tapped in Magic: The Gathering; the tapping part of regeneration is an effect that happens instead of destruction, so if the creature is already tapped (e.g., attacking), that part of the effect simply does nothing, and the rest of the shield (removing damage, removing from combat) still applies. You just need to activate the ability before the creature is destroyed, creating a "regenerate shield" that protects it from the next lethal damage or destroy effect. 
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What happens if a commander can't be regenerated?

If a Commander "can't be regenerated," it means the specific, old Regenerate ability (which taps the creature to save it from destruction) won't work if activated; however, it does not stop the Commander from going back to the Command Zone (or exile/hand/graveyard) as per normal Commander rules, allowing it to be cast again, because "can't be regenerated" only counters that single, specific mechanic, not all forms of return. 
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Can indestructible stop sacrifices?

No, indestructible does not prevent sacrifice in Magic: The Gathering; an indestructible creature can still be sacrificed by its controller or an opponent if an effect allows it, as sacrificing moves the permanent to the graveyard, it doesn't "destroy" it. Indestructible only stops effects that explicitly say "destroy" or lethal damage, not other removal methods like exiling, reducing toughness to zero, or being put into the graveyard via sacrifice. 
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Are diamonds really indestructible?

No, diamonds are not indestructible; while they are the hardest natural material (resisting scratches), they are brittle and can chip, crack, or shatter from sharp impacts, concentrated force, or hitting hard surfaces, especially along natural cleavage planes or at sharp points in certain cuts like marquise or pear. Think of hardness as scratch resistance (what diamonds excel at) versus toughness (resistance to breaking), which is where they can fail, despite their legendary hardness.
 
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Does indestructible prevent Armageddon?

But the original question is a yes. If you cast the spell to give your lands indestructible they will be protected from armageddon, which destroys lands.
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