Aether Poisoner | Creature | Human Artificer | Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Aether Poisoner enters the battlefield, you get {E}{E} (two energy counters).
Whenever Aether Poisoner attacks, you may pay {E}{E}. If you do, create a 1/1 colorless Servo artifact creature token. | Yongjae Choi
Gifted Aetherborn | Creature | Aetherborn Vampire | Deathtouch, lifelink | Ryan Yee
Glint-Sleeve Siphoner | Creature | Human Rogue | Menace
Whenever Glint-Sleeve Siphoner enters the battlefield or attacks, you get {E} (an energy counter).
At the beginning of your upkeep, you may pay {E}{E}. If you do, you draw a card and you lose 1 life. | Greg Opalinski
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