Copper, Meow of the World

Eminence — At the beginning of combat on your turn, if Copper, Meow of the World is in the command zone or on the battlefield, another target
Cat you control gets +3/+3 until end of turn.

Whenever another Cat you control attacks, you
may pay {1}{g}{w}. If you do, it gains trample and gets +X/+X until end of turn, X is its power.

His mighty meow strikes fear into his foes.