clockwork beast enters the battlefield with seven +1/+0 counters on it.
at end of combat, if clockwork beast attacked or blocked this combat, remove a +1/+0 counter from it.
x, t: 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.