Chobe, Chonkest of the World

Eminence - At the beginning of combat on
your turn, if Chobe, Chonkest of the World 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}{g}{w}. If you do, it gains trample
and gets +X/+X until end of turn, where X is
its power