
Dockworker Drone | Artifact Creature | Robot | This creature enters with a +1/+1 counter on it.
When this creature dies, put its counters on target creature you control. | Marco Gorlei

Starport Security | Artifact Creature | Robot Soldier | {3}{W}, {T}: Tap another target creature. This ability costs {2} less to activate if you control a creature with a +1/+1 counter on it. | Lie Setiawan

Dyadrine, Synthesis Amalgam | Legendary Artifact Creature | Construct | Trample
Dyadrine enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
Whenever you attack, you may remove a +1/+1 counter from each of two creatures you control. If you do, draw a card and create a 2/2 colorless Robot artifact creature token. | Igor Grechanyi