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

Gremlins laben sich in der Wildnis an Ansammlungen reinen Äthers, die auch von Bergleuten sehr geschätzt werden.

Äthergeoden-Schürferin

Immer wenn die Äthergeoden-Schürferin angreift, erhältst du {E}{E} (zwei Energiemarken).
Bezahle {E}{E}: Schicke die Äthergeoden-Schürferin ins Exil und bringe sie dann unter der Kontrolle ihres Besitzers ins Spiel zurück.

Dans la nature, les gremlins se nourrissent de nodules d'Éther pur, aussi très convoités par les mineurs.

Mineuse de géodes d'Éther

À chaque fois que la Mineuse de géodes d'Éther attaque, vous gagnez {E}{E} (deux marqueurs « énergie »).
Payez {E}{E} : Exilez la Mineuse de géodes d'Éther, puis renvoyez-la sur le champ de bataille sous le contrôle de son propriétaire.

野生のグレムリンは、鉱夫たちが掘り求めている純粋な霊気を食べる。

霊気晶の鉱夫

霊気晶の鉱夫が攻撃するたび、{E}{E}（エネルギー・カウンター２個）を得る。
{E}{E}を支払う：霊気晶の鉱夫を追放する。その後、これをオーナーのコントロール下で戦場に戻す。

Aethergeode Miner

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.

Modern Horizons 3 Commander

Aether Revolt

Aether Revolt Promos

After Aethergeode Miner returns to the battlefield, it will be a new object with no connection to the creature that was exiled. It won't be in combat or have any additional abilities it may have had when it was exiled. Any +1/+1 counters on it or Auras attached to it are removed, and any Equipment will no longer be attached.

Energy counters are a kind of counter that a player may have. They're not associated with any specific permanents.

Energy counters aren't mana. They don't go away as steps, phases, and turns end, and effects that add mana "of any type" can't give you energy counters.

If a spell or ability with one or more targets states that you "may pay" some amount of {E}, and each permanent that it targets has become an illegal target, the spell or ability won't resolve. You can't pay any {E} even if you want to.

If an effect says you get one or more {E}, you get that many energy counters. To pay one or more {E}, you lose that many energy counters. You can't pay more energy counters than you have. Any effects that interact with counters a player gets, has, or loses can interact with energy counters.

Keep track of how many energy counters each player has. Potential ways to track this include writing theme down on paper or using dice, but any method that is clear and mutually agreeable is fine. (At higher levels of tournament play, dice may not be allowed for tracking counters that players have.)

Some spells and abilities that give you {E} may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. You won't get any {E}.

Some triggered abilities state that you "may pay" a certain amount of {E}. You can't pay that amount multiple times to multiply the effect. You simply choose whether or not to pay that amount of {E} as the ability resolves.

Some triggered abilities that state that you "may pay" a certain amount of {E} describe an effect that happens "If you do." In that case, no player may take actions to try to stop the ability's effect after you make your choice. If the payment is followed by the phrase "When you do," then you'll choose any targets for that reflexive triggered ability and put it on the stack before players can take actions.

{E} is the energy symbol. It represents one energy counter.