Rat offering (You may cast this spell 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.
Patron of the Nezumi’s ability triggers even if an event puts this and multiple other permanents into the graveyard at the same time (Wrath of God, gang blocks, etc.)