Butters

Eminence - At the beginning of combat on your turn, if Butters is in the command
zone or on the battlefield, another target
Cat you control gets +3/+3 until the end of turn.
Whenever another Cat you control attacks,
you may pay {1}{b}{w}. If you do, it gains
trample and gets +X/+X until end of turn, where X is its power.