replacement effects do.
Regeneration is a destruction-replacement effect. “Regenerate [permanent]” means “The next time [permanent] would be destroyed this turn, instead remove all damage from it, tap it, and (if it’s in combat) remove it from combat.” Because it’s a replacement effect, it must be active before the attempted destruction event. Abilities that trigger from damage being dealt still trigger even if the permanent regenerates. See rule 419.6b.
Reminder text appears after a keyword ability printed on a card and on cards that might otherwise be commonly misunderstood. Reminder text is text that is italicized and in parentheses in the text box of a card. This text provides a summary of the game rule or clarifies what the card does, but it isn’t itself considered rules text. See rule 207.2.
An attacking or blocking creature is removed from combat if it leaves play (such as by being destroyed or removed from the game), if it regenerates (see rule 419.6b), if its controller changes, if it stops being a creature, or if an effect removes it from combat. A creature that is removed from combat stops being an attacking or blocking creature and can no longer assign combat damage or have combat damage assigned to it. Any combat damage that’s already on the stack assigned to or by the creature will still resolve normally. See rule 306.2 and rule 310.4a.
A card removed from the game is out of play. The effect that removed the card may specify a way for it to return. Some objects use the expression “set aside” for situations in which a card removed from the game can return to play. See rule 217.7, “Removed from the Game.”
A replacement effect is a type of continuous effect that “watches” for a specified event and replaces it with a different one. See rule 419, “Replacement and Prevention Effects.”
Replicate is a keyword that represents two abilities. The first is a static ability that functions while the spell is on the stack. The second is a triggered ability that functions while the spell is on the stack. “Replicate [cost]” means “As an additional cost to play this spell, you may pay [cost] any number of times” and “When you play this spell, if a replicate cost was paid for it, copy it for each time its replicate cost was paid. If the spell has any targets, you may choose new targets for any number of the copies.” See rule 502.52, “Replicate.”
A requirement to attack or block is any effect that forces one or more creatures to attack or block. All attacks and blocks must still be legal. See rule 500, “Legal Attacks and Blocks.”
When a spell or ability on top of the stack resolves, its controller carries out the instructions printed on the card, in the order written. When combat damage resolves, it’s dealt as previously assigned to the fullest extent possible. See rule 413, “Resolving Spells and Abilities.”
A player can choose to play an instant spell or activated ability when something else is already on the stack, rather than waiting for the earlier spell or ability to resolve first. The spell or ability is said to be played “in response to” the earlier spell or ability. See rule 408, “Timing of Spells and Abilities.”
A restriction on attacking or blocking is any effect that could prevent a creature from attacking or blocking. All attacks and blocks must still be legal. See rule 500, “Legal Attacks and Blocks.”
To reveal an object is to show that object to all players. If a one-shot effect reveals a card, the card is returned to its former state after all players have seen it. If the cost to play a spell or ability includes revealing a card, the card remains revealed from the time the spell or ability is announced until it leaves the stack.
Ripple is a triggered ability that functions only while the card with ripple is on the stack. “Ripple N” means “When you play this spell, you may reveal the top N cards of your library, or, if there are fewer than N cards in your library, you may reveal all the cards in your library. If you reveal cards from your library this way, you may play any of those cards with the same name as this spell without paying their mana costs, then put all revealed cards not played this way on the bottom of your library in any order.” See rule 502.56, “Ripple.”
An object’s rules text defines many of that object’s properties. Changing an object’s rules text changes the object’s properties.
To sacrifice a permanent, its controller moves it from the in-play zone directly to its owner’s graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a permanent he or she doesn’t control. If an effect instructs a player to sacrifice a permanent that he or she doesn’t control, nothing happens. Sacrificing a permanent doesn’t destroy it, so regeneration or other effects that replace destruction can’t affect it.
Scry is a static ability that functions while a spell or ability is resolving. “Scry N” means “Look at the top N cards of your library. Put any number of them on the bottom of your library in any order and the rest on top of your library in any order.” See rule 502.36, “Scry.”
