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01/10/2008

Gather Specimens isn’t targeted. It affects creatures that would enter the battlefield under any opponent’s control.

01/10/2008

Gather Specimens won’t retroactively change the control of creatures that have already enter the battlefield that turn.

01/10/2008

If a creature spell controlled by an opponent would resolve, it resolves, but the creature enters the battlefield under your control instead of the opponent’s control. Choices made when casting that spell (such as whether it was kicked or the value of X in the spell’s cost) are remembered. Any “enters the battlefield” triggered abilities will trigger after the creature is on the battlefield under your control.

01/10/2008

If the effect that puts a creature onto the battlefield also creates a delayed triggered ability, Gather Specimens doesn’t change who controls that ability. In the unearth example above, your opponent controls the ability that exiles the creature at the beginning of the end step. On the other hand, if the effect that puts a creature onto the battlefield grants a triggered ability to the creature (with “gains” or “has”), the player who controls the creature at the time the ability triggers will be the player who controls that ability. For example, if your opponent casts Makeshift Mannequin and you cast Gather Specimens in response, the creature will return to the battlefield under your control with a mannequin counter and it will have the ability “When this creature becomes the target of a spell or ability, sacrifice it.” If the ability triggers, you’ll control it, so you’ll have to sacrifice the creature.

01/10/2008

The above procedure means that if two opposing players have each cast Gather Specimens during the same turn and a creature would enter the battlefield under the control of one of them, it really will enter the battlefield under that player’s control. (The creature would enter the battlefield under player A’s control, so player B’s Gather Specimens affects it. Now that creature would enter the battlefield under player B’s control, so player A’s Gather Specimens affects it. Each replacement effect has now been used, so the creature will enter the battlefield under player A’s control.)