Target opponent sacrifices a creature of their choice that attacked or blocked this turn. If you control a Gideon planeswalker, that player sacrifices two of those creatures of their choice instead.
His triumph came not from victory over his enemies, but from the salvation of those who survived.
Gideon’s Triumph targets the player, not the creature or creatures to be sacrificed. A creature with hexproof may be sacrificed this way.
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wotc
A creature that was put onto the battlefield attacking didn’t attack, so it can’t be sacrificed.
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wotc
Controlling more than one planeswalker of the appropriate type won’t have any more of a benefit than just controlling one.
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wotc
Whether you control an appropriate planeswalker is checked only as the spell resolves.
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wotc
A creature that attacked and was removed from combat (such as by Spires of Orazca) still attacked, so it can be sacrificed.
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wotc
Gideon’s Triumph can be cast after combat damage has been dealt. In this case, the target player chooses one or two creatures that attacked or blocked this turn and have survived combat damage.
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wotc
Gideon’s Triumph can be cast before combat damage has been dealt. In this case, it can be cast before or after blockers have been chosen.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.