Can I respond to an activated ability in MTG?

Yes, you can almost always respond to an activated ability in Magic: The Gathering because they use the stack, allowing players to cast instants or activate other abilities in response before the original ability resolves, but you cannot respond to the payment of costs like tapping a creature or paying mana, as those happen immediately and don't use the stack; the main exception is mana abilities (like lands adding mana) which resolve instantly and can't be responded to at all.
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Can you respond to an activated ability?

Yes, in games like Magic: The Gathering, you absolutely can respond to most activated abilities because they go onto the stack like spells, allowing you to use instant-speed spells or other abilities in response, with the main exception being mana abilities, which resolve immediately and can't be responded to. You get priority to act after the ability is put on the stack but before it resolves, letting you use effects to counter it, change targets, or remove the source. 
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Can I respond to triggered abilities?

Yes, in games like Magic: The Gathering, you absolutely can respond to a triggered ability because it goes onto the stack just like a spell, allowing other players to cast instants or activate abilities in response before it resolves, following the "First-In, Last-Out" (FILO) principle. You can respond to triggers from your own permanents or your opponent's, using instants or abilities with Flash to interact with threats or set up combos, often leading to complex chains of triggers and responses. 
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Can you counter an activated ability?

Yes, you can counter an activated ability in Magic: The Gathering, but only with specific cards like Stifle, Disallow, or Voidslime, which explicitly say "counter target activated ability" or "counter target ability". Standard counterspells like Counterspell only work on spells, not abilities, but you can also stop an ability by making its target illegal (e.g., destroying the permanent) or by countering a triggered ability that it creates. Mana abilities cannot be countered.
 
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Can you react to a mana ability?

Mana abilities are among the few activated or triggered abilities that don't use the stack or require passing priority to resolve, so they cannot be responded to or targeted.
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How do ACTIVATED abilities work in Magic the Gathering? ┃ Manfred Plus Magic

Are mana-activated abilities instant?

Yes, mana abilities in Magic: The Gathering are effectively "instant" because they don't use the stack and resolve immediately, giving you mana as soon as you activate them, even in response to other spells, but they can't be responded to themselves, unlike spells or regular abilities. You can use them whenever you have priority, but they must be activated when paying costs (like tapping lands) or any time you could cast an instant, unless the card specifies otherwise (like "use only as a sorcery"). 
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Can you stop an activated ability in MTG?

Activated abilities cannot be countered by spells or abilities that counter spells, because they aren't spells. However, there are cards, such as Stifle, Squelch, and Voidslime, that do counter these abilities.
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Do activated abilities have summoning sickness?

Yes, activated abilities have summoning sickness if their cost includes the tap ({T}) or untap ({UT}) symbol, preventing their use until the creature has been under your control since your last turn, but abilities with only mana costs or other non-tapping costs (like discarding a card) can be used immediately. Summoning sickness restricts attacking and using {T}/{UT} abilities, not all activated abilities. 
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Can you stifle mana abilities?

Yes; Stifle makes no exception for abilities that produce mana but are not mana abilities. Note that, in case you don't know, Priest of Gix's ability is not a mana ability because its trigger event is not within the scope of mana abilities (C.R. 605.1b).
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Is tapping a land an activated ability?

Yes, tapping a land for mana is an activated ability, specifically a mana ability, following the format [Cost]: [Effect], where tapping (the "{T}" symbol) is the cost and adding mana is the effect, even if it's printed as reminder text or implicitly on basic lands. Because tapping is a cost, you can only do it once until the land untaps, and you can't use the same tap to pay for two different abilities at once.
 
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Can I respond to an ETB?

If there is an ETB trigger, then your opponent still receives priority, but you will have a chance to respond to the trigger when they pass to you. There is no special time for you to respond to a creature entering the battlefield if it doesn't have an ETB trigger and there is nothing else on the stack.
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What happens if I miss a triggered ability?

For all other triggered abilities, if the ability was missed prior to the current phase in the previous turn, instruct the players to continue playing. If it's been more than a turn since the trigger was missed, the ability is skipped with no further resolution.
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Can you react to triggered abilities in MTG?

Can You Respond to a Triggered Ability? Yes, you can! When a triggered ability goes onto the stack it creates an instance of priority for each player the same way putting a spell onto the stack does.
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Can you counterspell an ability in MTG?

No, you cannot use a standard Counterspell on an ability because spells and abilities are different things; abilities aren't spells. However, specific cards like Stifle, Trickbind, or Disallow can counter activated or triggered abilities because their text specifically targets abilities, not spells. 
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Is an activated ability the same as a triggered ability?

No, triggered abilities are not activated abilities; they are distinct types of abilities in games like Magic: The Gathering, with triggered abilities starting with "When," "Whenever," or "At" and activating automatically, while activated abilities have a [Cost]:[Effect] format and require a player to pay the cost to use them. You can't use mana meant for activating abilities to pay costs for triggered abilities, even if the triggered ability has a mana cost to use its effect. 
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Is tapping a card an activated ability?

Are Tap Abilities Activated Abilities? Early on in learning to play Magic you learn about summoning sickness and that it applies to “tap abilities.” (i.e.: abilities that include the tap symbol as a cost). These are activated abilities as they contain a colon, and the tap symbol is one of the listed costs.
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Do triggered abilities resolve if the creature dies?

A trigger will go on the stack and resolve independent of the permanent being on the battlefield, otherwise death triggers wouldn't work. But some abilities might have an “if you do” that causes them to fail when you can't.
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How to tell if an ability is a triggered ability?

A triggered ability can be identified by the words "when," "whenever," or "at", which will usually be found at the start of the ability. The phrase that contains one of those words lists the conditions (the trigger event or trigger state) where the ability will trigger.
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What happens if you counter an activated ability in MTG?

Merely countering an Activated or Triggered ability simply removes the ability from the Stack, so it does not resolve. This does not affect the source of the ability... Unless the thing doing the countering specifies otherwise.
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Can activated abilities be played as instants?

Yes, most activated abilities in Magic: The Gathering can be used at instant speed (any time you have priority), just like casting an instant, unless the ability specifically says otherwise, like "Activate only as a sorcery" or it requires tapping a creature that has summoning sickness. Abilities are activated, not cast, so rules for casting spells don't always apply directly. 
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Does Hexproof stop activated abilities?

Hexproof protects against any spells or abilities that target. It doesn't protect from a specific color, card type, or effect, but from the word “target”. Whenever a spell or ability would let a player choose a target, permanents and players that have hexproof are protected from that targeting action.
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Does flying count as an ability?

Yes, flying is considered an ability, especially in fantasy, games (like Magic: The Gathering where it's a core evasion keyword), and superpower lore, representing the power to move through the air, even though humans can't naturally do it. It's a common "superpower" granting freedom, speed, and evasion, achieved via wings, anti-gravity, or magic. 
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Is tapping an artifact an activated ability?

Yes, tapping an artifact is a keyworded action that is often the cost for an activated ability, marked with the tap symbol ({T}) before the colon (e.g., {T}: Add {C}). While tapping itself isn't an ability, it's how you pay for powerful effects on artifacts (like mana or other actions) and is distinct from abilities triggered by "when," "whenever," or "at". 
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Can you activate abilities during combat?

Yes, you can activate most abilities during combat in games like Magic: The Gathering, often at "instant speed" (any time you have priority), unless the ability specifically restricts when it can be used (e.g., "only as a sorcery"). This allows for tactical plays like activating a creature's tap ability before damage, using a sacrifice ability to remove a blocker, or tapping mana sources for effects during different combat steps (Beginning of Combat, Declare Blockers, End of Combat). 
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