I'm fairly new to magic and don't play all that often, so I've never played with an instant threaten effect before. A couple questions on Turn Against:
1) If I declare attacks, my opponent declares blocks, and I then cast this on one of the blockers, does the thing it blocked get through, or is it still blocked and just doesn't take damage?
2) If I cast this on an opponent's creature that he's attacking with, is it then no longer attacking me and I get to block with it?
Also, just in general, are there any other fun combos/benefits of this being instant instead of a sorcery like Act of Treason?
1) A blocked creature remains blocked until it is removed from combat, an effect says that it becomes unblocked, or the combat phase ends.
So while you are removing the blocker from combat, neither creature will deal damage unless the attacking creature has trample.
2) Yes
In response to someone playing a card or activating an ability that causes you to sacrifice a creature, you could gain control of a creature they control and sacrifice it.
1) If I declare attacks, my opponent declares blocks, and I then cast this on one of the blockers, does the thing it blocked get through, or is it still blocked and just doesn't take damage?
2) If I cast this on an opponent's creature that he's attacking with, is it then no longer attacking me and I get to block with it?
Also, just in general, are there any other fun combos/benefits of this being instant instead of a sorcery like Act of Treason?
So while you are removing the blocker from combat, neither creature will deal damage unless the attacking creature has trample.
2) Yes
In response to someone playing a card or activating an ability that causes you to sacrifice a creature, you could gain control of a creature they control and sacrifice it.
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