Marshal of the Lost {2}{W}{B}
Creature — Orc Warrior
Deathtouch
Whenever you attack, target creature gets +X/+X until end of turn, where X is the number of attacking creatures.
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Cards that do something similar expected a card that isn't here?
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Living History 83%
$0.10#25841
"Whenever you attack, if a card left your graveyard this turn, target attacking creature gets +2/+0 until end of turn."
Rampaging Geoderm 82%
$0.13#21692
"Whenever you attack, target attacking creature gets +1/+1 until end of turn. If it's attacking a battle, put a +1/+1 counter on it instead."
Bast, Panther Goddess 80%
$2.79#17534
"Whenever you attack, target attacking creature gets +X/+X until end of turn, where X is the number of creatures you control."