Clockwork Beast

Clockwork Beast enters the battlefield with seven +1/+0 counters on it.

At end of combat, if Clockwork Beast attacked/blocked this combat, remove a +1/+0 counter from it.

[Variable Colorless], [Tap]: Put up to X +1/+0 counters on Clockwork Beast. This ability can't cause the total number of +1/+0 counters on Clockwork Beast to be greater than seven. Activate this ability only during your upkeep.