Clockwork Steed

{4} · Artifact Creature — Horse

This creature enters with four +1/+0 counters on it. This creature can't be blocked by artifact creatures. At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it. {X}, {T}: 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.

Motor: se resuelve a mano

Rulings (4)

If Clockwork Steed has four or fewer +1/+0 counters on it when its last ability resolves, it can wind up with a maximum of four such counters on it. If it has four or more +1/+0 counters on it, the ability will have no effect.
Wizards of the Coast · 2008-10-01
When Clockwork Steed's last ability resolves, you can choose to put fewer than X +1/+0 counters on it.
Wizards of the Coast · 2008-10-01
Can attack or block even if it has no counters.
Wizards of the Coast · 2004-10-04
Loses a counter even if it is affected by a Fog-like effect which prevents it from dealing damage.
Wizards of the Coast · 2004-10-04