Clockwork Swarm enters the battlefield with four +1/+0 counters on it.
Clockwork Swarm can't be blocked by Walls.
At end of combat, if Clockwork Swarm attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on Clockwork Swarm. This ability can't cause the total number of +1/+0 counters on Clockwork Swarm to be greater than four. Activate this ability only during your upkeep.
Near Mint - $0.25
Near Mint Non-English - $0.25
Lightly Played - $0.24
Lightly Played Non-English - $0.24
Moderately Played - $0.20
Moderately Played Non-English - $0.20
Heavily Played - $0.15
Heavily Played Non-English - $0.15
Damaged - $0.13
Damaged Non-English - $0.13