Zharvakko, the Witchdoctor

Partner with Chen, the holy knight. (when this creature enters the battlefield, target player may put Chen into their hand from their library, then shuffle)
{t}{b}{b}{g}{g}: Deathward. Create a 5/1 black artifact creature with haste and indestructible. Sacrifice it at end of turn.
If you control Chen and Zharvakko at the beginning of your upkeep, you win the game.