Übertaktete Elektromagierin

Zu Beginn des Kampfes in deinem Zug kannst du {E}{E}{E} bezahlen. Falls du dies tust, lege eine +1/+1-Marke auf die Übertaktete Elektromagierin.
Immer wenn die Übertaktete Elektromagierin angreift, verdopple ihre Stärke bis zum Ende des Zuges.
Immer wenn die Übertaktete Elektromagierin einer Kreatur Kampfschaden zufügt und falls jener Kreatur in diesem Zug überschüssiger Schaden zugefügt wurde, erhältst du X {E}, wobei X gleich dem überschüssigen Schaden ist.

Électromancienne survoltée

Au début du combat pendant votre tour, vous pouvez payer {E}{E}{E}. Si vous faites ainsi, mettez un marqueur +1/+1 sur l'Électromancienne survoltée.
À chaque fois que l'Électromancienne survoltée attaque, doublez sa force jusqu'à la fin du tour.
À chaque fois que l'Électromancienne survoltée inflige des blessures de combat à une créature, si cette créature a subi un surplus de blessures ce tour-ci, vous gagnez X {E}, X étant ce surplus de blessures.

超稼働の電術師

あなたのターンの戦闘の開始時に、{E}{E}{E}を支払ってもよい。そうしたなら、超稼働の電術師の上に＋１/＋１カウンター１個を置く。
超稼働の電術師が攻撃するたび、ターン終了時まで、これのパワーを２倍にする。
超稼働の電術師がクリーチャー１体に戦闘ダメージを与えるたび、そのクリーチャーがこのターンに余剰のダメージを受けていた場合、{E}Ｘ個を得る。Ｘは、その余剰のダメージの点数に等しい。

Overclocked Electromancer

At the beginning of combat on your turn, you may pay {E}{E}{E}. If you do, put a +1/+1 counter on Overclocked Electromancer.
Whenever Overclocked Electromancer attacks, double its power until end of turn.
Whenever Overclocked Electromancer deals combat damage to a creature, if that creature was dealt excess damage this turn, you get X {E}, where X is that excess damage.

Modern Horizons 3 Commander

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.

Excess damage has been dealt to a creature if the damage dealt to it is greater than lethal damage. Usually, this means damage greater than its toughness, although damage already marked on the creature is taken into account.

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.

To double Overclocked Electromancer's power, it gets +X/+0, where X is its power when its second ability resolves.

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