Gremlins in the wild feed on nodules of pure aether, which are also prized by miners.

Aethergeode Miner

Whenever Aethergeode Miner attacks, you get {EE} (two energy counters).
Pay {EE}: Exile Aethergeode Miner, then return it to the battlefield under its owner's control.

Whenever this creature attacks, you get {E}{E} (two energy counters).
Pay {E}{E}: Exile this creature, then return it to the battlefield under its owner's control.

Modern Horizons 3 Commander

Whenever Aethergeode Miner attacks, you get {E}{E} (two energy counters).
Pay {E}{E}: Exile Aethergeode Miner, then return it to the battlefield under its owner's control.