Clockwork Swarm

four generic mana Artifact Creature — InsectPower and toughness0/3

This creature enters with four +1/+0 counters on it.

This creature can't be blocked by Walls.

At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it.

X generic mana , tap this permanent : Put up to X +1/+0 counters on this creature. This ability can't cause the total number of +1/+0 counters on this creature to be greater than four. Activate only during your upkeep.

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0.18 $

7 printings

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Clockwork Swarm rulings

2004-10-04
Loses a counter even if it is affected by a Fog-like effect which prevents it from dealing damage.
2004-10-04
Can attack or block even if it has no counters.
2004-10-04
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.