EightInchski, Prince of Song

Whenever another creature you control leaves the battlefield, create a 2/2 Flying Trumpet creature
token with flying
Whenever a Flying Trumpet creature token
enters the battlefield under your control target
opponent gains control of it. At the beginning
of your upkeep, exile the top card of each players
library if they control a Flying Trumpet creature
token. You may cast spells from among the
exiled cards until the end of turn using mana as if
it were any color to cast those spells