Moral Support

When Moral Support enters the battlefield, put a happy counter on Moral Support.
At the beginning of your precombat main phase, remove a happy counter from Moral Support.
If a happy counter was removed this way, creatures you control get +X/+X until your next end step.
If a happy counter wasn't removed this way, creatures you control get -X/-X until the end of turn.
At the beginning of your end step, you may pay {2}, if you