Shinobi's Trap

If an opponent declared two or less blockers this combat phase, you may pay {u}{b} rather than pay
Shinobi's Trap's mana cost.
Until end of turn, creatures you control gain "Whenever this creature deals combat damage to a player or a planeswalker that player controls, that player discards a card."
_________________________________________
They won't kill you. They'll just render you helpless.