Murok Bloodfire

Partner with Garok Bloodfire (when this creature
enters the battlefield target player may put Garok Bloodfire into their hand from their library, then
shuffle.)
Sacrifice a creature: the next instant or sorcery
spell you cast, cost {x} less to cast where x is the sacrificed creatures converted mana cost. Activate
this ability only once each turn.
Weakness compels strength. Betrayal begets blood.
This is the law of the Clans.