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Clockwork Avian
{5}
Artifact Creature -- Bird
0/4
Flying
~this~ enters with four +1/+0 counters on it.
At end of combat, if ~this~ attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on ~this~. This ability can't cause the total number of +1/+0 counters on ~this~ to be greater than four. Activate only during your upkeep.

Clockwork Beast
{6}
Artifact Creature -- Beast
0/4
~this~ enters with seven +1/+0 counters on it.
At end of combat, if ~this~ attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on ~this~. This ability can't cause the total number of +1/+0 counters on ~this~ to be greater than seven. Activate only during your upkeep.

Clockwork Steed
{4}
Artifact Creature -- Horse
0/3
~this~ enters with four +1/+0 counters on it.
~this~ can't be blocked by artifact creatures.
At end of combat, if ~this~ attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on ~this~. This ability can't cause the total number of +1/+0 counters on ~this~ to be greater than four. Activate only during your upkeep.

Clockwork Swarm
{4}
Artifact Creature -- Insect
0/3
~this~ enters with four +1/+0 counters on it.
~this~ can't be blocked by Walls.
At end of combat, if ~this~ attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on ~this~. This ability can't cause the total number of +1/+0 counters on ~this~ to be greater than four. Activate only during your upkeep.

Daredevil Dragster
{3}
Artifact -- Vehicle
4/4
At end of combat, if ~this~ attacked or blocked this combat, put a velocity counter on it. Then if it has two or more velocity counters on it, sacrifice it and draw two cards.
Crew 2 (Tap any number of creatures you control with total power 2 or more: ~this~ becomes an artifact creature until end of turn.)