Wurmbeben

Verdorben — Erzeuge einen X/X grünen Phyrexianer-Wurm-Kreaturenspielstein, der Trampelschaden verursacht und Toxisch 1 hat, wobei X gleich der Menge Mana ist, die ausgegeben wurde, um diesen Zauberspruch zu wirken. Dann erzeugst du für jeden Gegner mit drei oder mehr Giftmarken einen weiteren solchen Spielstein.
Rückblende {8}{G}{G}

Tremblement de guivre

Corrompu — Créez un jeton de créature X/X verte Phyrexian et Guivre avec le piétinement et toxique 1, X étant la quantité de mana dépensée pour lancer ce sort. Puis, pour chaque adversaire avec au moins trois marqueurs « poison », vous créez un autre de ces jetons.
Flashback {8}{G}{G}

ワーム地震

堕落 — トランプルと毒性１を持つ緑のＸ/Ｘのファイレクシアン・ワーム・クリーチャー・トークン１体を生成する。Ｘはこの呪文を唱えるために支払われたマナの点数に等しい。その後、３個以上の毒カウンターを持つ対戦相手１人につき１体のそのトークンを生成する。
フラッシュバック{8}{G}{G}

亚龙暴震

腐化～派出一个X/X绿色，具践踏与下毒1的非瑞人／亚龙衍生生物，X为施放此咒语时支付的法术力数量。然后每有一位具有三个或更多中毒指示物的对手，你便再派出一个前述衍生物。
返照{8}{G}{G}

Wurmquake

Corrupted — Create an X/X green Phyrexian Wurm creature token with trample and toxic 1, where X is the amount of mana spent to cast this spell. Then for each opponent with three or more poison counters, you create another one of those tokens.
Flashback {8}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Phyrexia: All Will Be One Commander

Corrupted — Create an X/X green Phyrexian Wurm creature token with trample and toxic 1, where X is the amount of mana spent to cast this spell. Then for each opponent with three or more poison counters, you create another one of those tokens.
Flashback {8}{G}{G}

"Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."

A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.

If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.

The first token that Wurmquake creates as it resolves is created and enters the battlefield before the rest of them, then you create a number of tokens equal to the number of opponents with three of more poison counters and they enter the battlefield at the same time.

To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.

You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.

You can't choose to spend more mana to cast Wurmquake than you're asked to just to make a bigger Wurm. In most cases, it's a 6/6 Phyrexian Wurm the first time, and a 10/10 Phyrexian Wurm when you cast Wurmquake with flashback. However, if there are any additional costs to cast it, the mana spent to pay those costs counts.

You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.