Pechhaltiger Strahl

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 die Bibliothek.)
Der Pechhaltige Strahl fügt einer Kreatur deiner Wahl 4 Schadenspunkte zu.

Salve bitumeuse

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.)
La Salve bitumeuse inflige 4 blessures à une créature ciblée.

瀝青破

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。）
クリーチャー１体を対象とする。瀝青破はそれに４点のダメージを与える。

Bituminous Blast

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.)
Bituminous Blast deals 4 damage to target creature.

Foundations Jumpstart

Modern Horizons 3 Commander

Warhammer 40,000 Commander

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 of your library in a random order.)
Bituminous Blast deals 4 damage to target creature.

Forgotten Realms Commander

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.