Aurorawandler

Immer wenn der Aurorawandler einem Spieler Kampfschaden zufügt, erhältst du entsprechend viele {E}.
Zu Beginn des Kampfes in deinem Zug kannst du {E}{E} bezahlen. Wenn du dies tust, wird der Aurorawandler zu einer Kopie einer anderen Kreatur deiner Wahl, die du kontrollierst, außer dass er diese Fähigkeit und „Immer wenn diese Kreatur einem Spieler Kampfschaden zufügt, erhältst du entsprechend viele {E}" hat.

Modeleuse d'aurore

À chaque fois que la Modeleuse d'aurore inflige des blessures de combat à un joueur, vous gagnez autant de {E}.
Au début du combat pendant votre tour, vous pouvez payer {E}{E}. Quand vous faites ainsi, la Modeleuse d'aurore devient une copie d'une autre créature ciblée que vous contrôlez, excepté qu'elle a cette capacité et « À chaque fois que cette créature inflige des blessures de combat à un joueur, vous gagnez autant de {E}. »

オーロラの変幻者

オーロラの変幻者がプレイヤー１人に戦闘ダメージを与えるたび、あなたはその点数に等しい個数の{E}を得る。
あなたのターンの戦闘の開始時に、{E}{E}を支払ってもよい。そうしたとき、あなたがコントロールしていてこれでないクリーチャー１体を対象とする。オーロラの変幻者は、この能力と「このクリーチャーがプレイヤー１人に戦闘ダメージを与えるたび、あなたはその点数に等しい個数の{E}を得る。」を持つことを除きそれのコピーになる。

极光变幻客

每当极光变幻客对任一牌手造成战斗伤害时，你得到等量的{E}。
在你回合的战斗开始时，你可以支付{E}{E}。当你如此作时，极光变幻客成为另一个目标由你操控之生物的复制品，但它具有此异能与「每当此生物对任一牌手造成战斗伤害时，你得到等量的{E}。」

Aurora Shifter

Whenever this creature deals combat damage to a player, you get that many {E}.
At the beginning of combat on your turn, you may pay {E}{E}. When you do, this creature becomes a copy of another target creature you control, except it has this ability and "Whenever this creature deals combat damage to a player, you get that many {E}."

Modern Horizons 3 Commander

Whenever Aurora Shifter deals combat damage to a player, you get that many {E}.
At the beginning of combat on your turn, you may pay {E}{E}. When you do, Aurora Shifter becomes a copy of another target creature you control, except it has this ability and "Whenever this creature deals combat damage to a player, you get that many {E}."

Aurora Shifter copies exactly what was printed on the original creature and nothing else, with the listed exception (unless that permanent is copying something else; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, and so on.

Because Aurora Shifter isn't entering the battlefield when it becomes a copy of another creature, any "When [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied creature won't apply.

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.

If the copied creature has {X} in its mana cost, X is 0.

If the copied creature is copying something else, then Aurora Shifter becomes a copy of whatever that creature copied (with the listed exception).

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.

You don't choose a target for Aurora Shifter's last ability at the time it triggers. Rather, a second "reflexive" ability triggers when you pay {E}{E} this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.

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