Vigil for the Lost⁣ - Scars of Mirrodin⁣ (Uncommon)⁣ [26]

Vigil for the Lost allows you to gain life whenever one of your creatures dies, as long as you pay the appropriate amount of mana. This can create a significant life buffer in decks that sacrifice creatures for value, such as Aristocrat-style builds or those focused on tokens. However, its effectiveness is limited by your available mana and the number of creatures you control, so it's best used in a deck that can consistently generate sacrifice fodder.