Crackdown Construct | Artifact Creature | Construct | Whenever you activate an ability of an artifact or creature that isn't a mana ability, Crackdown Construct gets +1/+1 until end of turn. | Johannes Voss
Filigree Crawler | Artifact Creature | Insect | When Filigree Crawler dies, create a 1/1 colorless Thopter artifact creature token with flying. | James Paick
Irontread Crusher | Artifact | Vehicle | Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.) | Jason A. Engle
Treasure Keeper | Artifact Creature | Construct | When Treasure Keeper dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order. | James Paick
Untethered Express | Artifact | Vehicle | Trample
Whenever Untethered Express attacks, put a +1/+1 counter on it.
Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.) | James Ryman