Zarvok, from D's dungeon

Afflict 2, haste
Other creatures you control have afflict 2.

Whenever a creature you control with afflict deals combat damage to an opponent, create a 1/1 black
and red demon creature token with wither.

At the beginning of your upkeep, if you control 10 demon tokens, sacrifice them and each opponent loses 10 life, you gain 10 life.