Clockwork Steed [Fifth Edition]

Set: Fifth Edition Type: Artifact Creature — Horse Rarity: Uncommon Cost: {4} Clockwork Steed enters the battlefield with four +1/+0 counters on it.Clockwork Steed can't be blocked by artifact creatures.At end of combat, if Clockwork Steed attacked or blocked this combat, remove a +1/+0 counter from it.{X}, {T}: Put up to X +1/+0 counters on Clockwork Steed. This ability can't cause the total number of +1/+0 counters on Clockwork Steed to be greater than four. Activate only during your upkeep.