Okaun, Eye of Chaos

Partner with Zndrsplt, Eye of Wisdom (When
this enters the battlefield, target player
may put Zndrsplt into their hand from their
library, then shuffle their library.)
At the beginning of combat on your turn, flip
a coin until you lose a flip.
Whenever a player wins a coin flip, double
this creature's power and toughness until end of
turn.