Wolf of Devil's Breach

Lobo de Brecha del Diablo (Wolf of Devil's Breach) (es)

Creature - Elemental Wolf | Power/Toughness: 5 / 5 (CMC 5)
Whenever Wolf of Devil's Breach attacks, you may pay and discard a card. If you do, Wolf of Devil's Breach deals damage to target creature or planeswalker equal to the discarded card's mana value.