Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)
There are many important moments in the story, but the most crucialâ€”called â€œstory spotlightsâ€â€”are shown on cards. These cards have the Planeswalker symbol in their text box; this symbol has no effect on gameplay. You can read more about these events in the official Magic fiction at http://www.mtgstory.com.
Triggered abilities use the word â€œwhen,â€ â€œwhenever,â€ or â€œat.â€ Theyâ€™re often written as â€œ[Trigger condition], [effect].â€ Some keyword abilities, such as prowess and fabricate, are triggered abilities and will have â€œwhen,â€ â€œwhenever,â€ or â€œatâ€ in their reminder text.
If you counter a delayed triggered ability that triggers at the beginning of the â€œnextâ€ occurrence of a specified step or phase, that ability wonâ€™t trigger again the following time that phase or step occurs.
An activated mana ability is one that adds mana to a playerâ€™s mana pool as it resolves, doesnâ€™t have a target, and isnâ€™t a loyalty ability. A triggered mana ability is one that adds mana to a playerâ€™s mana pool and triggers on an activated mana ability.
Activated abilities are written in the form â€œCost: Effect.â€ Some keyword abilities, such as equip and crew, are activated abilities and will have colons in their reminder texts.
Abilities that create replacement effects, such as a permanent entering the battlefield tapped or with counters on it, canâ€™t be targeted. Abilities that apply â€œas [this creature] enters the battlefieldâ€ are also replacement effects and canâ€™t be targeted.
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