Arahbo, Roar of the World (Oversized) [Commander 2017 Oversized]

Eminence — At the beginning of combat on your turn, if Arahbo, 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 1GW. If you do, it gains trample and gets +X/+X until end of turn, where X is its power.