Mocha, Roar of the World

Eminence At the beginning of combat on your
turn, if Mocha, Roar 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, where X is its power.