Patron of the Nezumi (French) - "Patron des nezumi" (PSAL-A25) - Salvat 2005

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.