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Clockwork Steed cannot be blocked by artifact creatures.
When Clockwork Steed comes into play, put four +1/+0 counters on it. At the end of any combat in which Clockwork Steed attacked or blocked, remove one of these counters.
oX, : Put X +1/+0 counters on Clockwork Steed. You may have no more than four of these counters on Clockwork Steed. Use this ability only during your upkeep.
[5E]:U [HM]:C [ME2]:U