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 this ability only during your upkeep.
Near Mint - $8.500
Lightly Played - $6.800
Moderately Played - $5.900
Heavily Played - $5.100
Damaged - $4.300
Near Mint Spanish - $8.500
Lightly Played Spanish - $6.800
Moderately Played Spanish - $5.900
Heavily Played Spanish - $5.100
Damaged Spanish - $4.300