Ätheriumhorn-Hexer

{1}{U}{R}: Bringe den Ätheriumhorn-Hexer auf die Hand seines Besitzers zurück.
Kaskade (Wenn du diesen Zauberspruch wirkst, schicke solange die oberste Karte deiner Bibliothek ins Exil, bis du eine Karte aufdeckst, die weniger kostet als diese und die kein Land ist. Du kannst sie wirken, ohne ihre Manakosten zu bezahlen. Lege die so ins Exil geschickten Karten in zufälliger Reihenfolge unter deine Bibliothek.)

Hechicero cuernos de eterium

{1}{U}{R}: Regresa al Hechicero cuernos de eterium a la mano de su propietario.
Cascada. (Cuando lances este hechizo, exilia las primeras cartas de tu biblioteca hasta que exilies una carta que no sea tierra que cueste menos. Puedes lanzar esa carta sin pagar su coste de maná. Pon las cartas exiliadas en el fondo de tu biblioteca en un orden aleatorio.)

Sorcier à cornes d'étherium

{1}{U}{R} : Renvoyez le Sorcier à cornes d'étherium dans la main de son propriétaire.
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.)

Stregone Corna di Eterium

{1}{U}{R}: Fai tornare lo Stregone Corna di Eterium in mano al suo proprietario.
Cascata (Quando lanci questa magia, esilia carte dalla cima del tuo grimorio finché non esili una carta non terra che costa meno. Puoi lanciarla senza pagare il suo costo di mana. Metti le carte esiliate in fondo al tuo grimorio in ordine casuale.)

エーテリウム角の魔術師

{1}{U}{R}：エーテリウム角の魔術師をオーナーの手札に戻す。
続唱 （あなたがこの呪文を唱えたとき、あなたのライブラリーの一番上のカードを、コストがより低い土地でないカードが追放されるまで追放する。 あなたはそれをそのマナ・コストを支払うことなく唱えてもよい。その追放したカードを、無作為の順番で一番下に置く。）

Etherium-Horn Sorcerer

{1}{U}{R}: Return this creature to its owner's hand.
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.)

The List

Commander 2017

{1}{U}{R}: Return Etherium-Horn Sorcerer to its owner's hand.
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.)

Planechase Anthology

{1}{U}{R}: Return Etherium-Horn Sorcerer to its owner's hand.
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.)

Commander 2016

Commander 2015

Etherium-Horn Sorcerer's first ability can only be activated when it is on the battlefield. If Etherium-Horn Sorcerer isn't on the battlefield when the ability resolves, the ability won't do anything.

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.