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Flying
Clockwork Avian enters the battlefield with four +1/+0 counters on it.
At end of combat, if Clockwork Avian attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on Clockwork Avian. This ability can't cause the total number of +1/+0 counters on Clockwork Avian to be greater than four. Activate only during your upkeep.
Can attack or block even if it has no counters.
If the ability to add counters resolves when there are already the maximum number of counters on it, any counters over the maximum are simply not added.
Loses a counter even if it is affected by a Fog-like effect which prevents it from dealing damage.
