Assaultron Dominator (PIP 582)

Artifact Creature — Robot • Mana cost: {1}{R} • Fallout • Rare

When this creature enters, you get {E}{E} (two energy counters).
Whenever an artifact creature you control attacks, you may pay {E}. If you do, put your choice of a +1/+1, first strike, or trample counter on that creature.

Illustrated by Viko Menezes.