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Cascade

Cascade is a triggered ability that functions only while the spell with cascade is on the stack. “Cascade” means “When you cast this spell, exile cards from the top of your library until you exile a nonland card whose mana value is less than this spell’s mana value. You may cast that card without paying its mana cost if the resulting spell’s mana value is less than this spell’s mana value. Then put all cards exiled this way that weren’t cast on the bottom of your library in a random order.”

If an effect allows a player to take an action with one or more of the exiled cards “as you cascade,” the player may take that action after they have finished exiling cards due to the cascade ability. This action is taken before choosing whether to cast the last exiled card or, if no appropriate card was exiled, before putting the exiled cards on the bottom of their library in a random order.

If a spell has multiple instances of cascade, each triggers separately.

If you choose a card you can’t cast (because there are no legal targets for the spell, for example), nothing happens to it. It remains in its owner’s hand.

If you cast a card “without paying its mana cost,” the value of any X in the card’s mana cost must be 0. You can’t pay any alternative costs for that card. On the other hand, if the card has optional additional costs (such as kicker or replicate), you may pay those when you cast the card. If the card has mandatory additional costs (such as Fling does), you must pay those when you cast the card.

If you choose a card, you cast it as part of the resolution of this ability. Timing restrictions based on the card’s type are ignored. Other restrictions are not (such as “Cast [this card] only during your end step”).

You choose a total of one card, and that card can’t be a creature or a land.