Wolf of Devil's Breach 
Creature — Elemental Wolf
Whenever this creature attacks, you may pay 
and discard a card. If you do, this creature deals damage to target creature or planeswalker equal to the discarded card's mana value.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL