Patron of the Nezumi

Patron of the Nezumi

Legendary Creature - Spirit | Power/Toughness: 6 / 6 (CMC 7)
Rat offering (You may cast this card any time you could cast an instant by sacrificing a Rat and paying the difference in mana costs between this and the sacrificed Rat. Mana cost includes color.)
Whenever a permanent is put into an opponent's graveyard, that player loses 1 life.