
Foundry Hornet | Creature | Insect | Flying
When Foundry Hornet enters the battlefield, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn. | Christopher Moeller

Gifted Aetherborn | Creature | Aetherborn Vampire | Deathtouch, lifelink | Ryan Yee

Ironclad Revolutionary | Creature | Aetherborn Artificer | When Ironclad Revolutionary enters the battlefield, you may sacrifice an artifact. If you do, put two +1/+1 counters on Ironclad Revolutionary and each opponent loses 2 life. | Eric Deschamps

Sly Requisitioner | Creature | Human Artificer | Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Whenever a nontoken artifact you control is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token. | Dan Scott

Vengeful Rebel | Creature | Aetherborn Warrior | Revolt — When Vengeful Rebel enters the battlefield, if a permanent you controlled left the battlefield this turn, target creature an opponent controls gets -3/-3 until end of turn. | Tomasz Jedruszek

Weldfast Engineer | Creature | Human Artificer | At the beginning of combat on your turn, target artifact creature you control gets +2/+0 until end of turn. | Sara Winters

Winding Constrictor | Creature | Snake | If one or more counters would be put on an artifact or creature you control, that many plus one of each of those kinds of counters are put on that permanent instead.
If you would get one or more counters, you get that many plus one of each of those kinds of counters instead. | Izzy