In den Zeit-Vortex

Kaskade (Wenn du diesen Zauberspruch wirkst, schicke Karten oben von deiner Bibliothek ins Exil, bis du eine Nichtland-Karte ins Exil schickst, die weniger kostet. Du kannst sie wirken, ohne ihre Manakosten zu bezahlen. Lege die so ins Exil geschickten Karten in zufälliger Reihenfolge unter deine Bibliothek.)
Abprall (Falls du diesen Zauberspruch aus deiner Hand wirkst, schicke ihn ins Exil, sowie er verrechnet wird. Zu Beginn deines nächsten Versorgungssegments kannst du diese Karte aus dem Exil wirken, ohne ihre Manakosten zu bezahlen.)

Dans le Tourbillon du Temps

Cascade (Quand vous lancez ce sort, exilez les cartes du dessus de votre bibliothèque jusqu'à ce que vous exiliez une carte non-terrain d'un coût inférieur. Vous pouvez la lancer sans payer son coût de mana. Mettez les cartes exilées au-dessous de la bibliothèque dans un ordre aléatoire.)
Rebond (Si vous lancez ce sort depuis votre main, exilez-le au moment où il se résout. Au début de votre prochain entretien, vous pouvez lancer cette carte depuis l'exil sans payer son coût de mana.)

タイム・ボルテックスの中へ

続唱（あなたがこの呪文を唱えたとき、コストがこれより低く土地でないカード１枚が追放されるまで、あなたのライブラリーの一番上から１枚ずつ追放していく。それをマナ・コストを支払うことなく唱えてもよい。それらの追放したカードを、無作為の順番で一番下に置く。）
反復（この呪文をあなたの手札から唱えていたなら、これの解決に際し、これを追放する。次のあなたのアップキープの開始時に、このカードを追放領域からマナ・コストを支払うことなく唱えてもよい。）

Into the Time Vortex

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Doctor Who

A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.

Cascade triggers when you cast the spell, meaning that it resolves before that spell. If you end up casting the exiled card, it will go on the stack above the spell with cascade.

Due to a 2021 rules change to cascade, not only do you stop exiling cards if you exile a nonland card with lesser mana value than the spell with cascade, but the resulting spell you cast must also have lesser mana value. Previously, in cases where a card's mana value differed from the resulting spell, such as with some modal double-faced cards or cards with an Adventure, you could cast a spell with a higher mana value than the exiled card.

If a spell with cascade is countered, the cascade ability will still resolve normally.

If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast the card.

The mana value of a split card is determined by the combined mana cost of its two halves. If cascade allows you to cast a split card, you may cast either half but not both halves.

When the cascade ability resolves, you must exile cards. The only optional part of the ability is whether or not you cast the last card exiled.

You exile the cards face up. All players will be able to see them.