|Card Type:||Artifact Creature|
Clockwork Avian comes into play with four +1/+0 counters on it.
Clockwork Avian can't have more than four +1/+0 counters on it.
At end of combat, if Clockwork Avian attacked or blocked this turn, remove a +1/+0 counter from it.
X, T: Put X +1/+0 counters on Clockwork Avian. Play this ability only during your upkeep.