Wolf of Devil's Breach {3}{R}{R}
Creature — Elemental Wolf
Whenever this creature attacks, you may pay {1}{R} and discard a card. If you do, this creature deals damage to target creature or planeswalker equal to the discarded card's mana value.
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Cards that do something similar expected a card that isn't here?
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Creepy Puppeteer 81%
$0.19#25029
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Abyssal Nightstalker 81%
$0.50#27330
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Dauthi Mindripper 81%
$0.26#22949
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Mindstab Thrull 81%
#26488
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Shrieking Specter 81%
$1.08#30458
"Whenever this creature attacks, defending player discards a card."
Smirking Spelljacker 80%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Xantid Swarm 80%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."