Throes of Chaos

three generic mana one red mana Sorcery

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.)

Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

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Showing Secrets of Strixhaven Commander#257

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Throes of Chaos rulings

2021-06-18
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
2021-06-18
If the card has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2021-06-18
You exile the cards face up. All players will be able to see them.
2021-06-18
If a spell with cascade is countered, the cascade ability will still resolve normally.
2021-06-18
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.
2021-06-18
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.
2021-06-18
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.
2021-06-18
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.
2021-06-18
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.
2019-06-14
When a spell you cast with retrace resolves or is countered, it's put back into your graveyard. You may use the retrace ability to cast it again.
2019-06-14
Throes of Chaos does nothing as it resolves. All of its chaos happens before it resolves.

Throes of Chaos keyword rules

Retrace Rule 702.81

Retrace is a static ability that functions while the card with retrace is in a player’s graveyard. “Retrace” means “You may cast this card from your graveyard by discarding a land card as an additional cost to cast it.” Casting a spell using its retrace ability follows the rules for paying additional costs in rules and –h.

Cascade Rule 702.85

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.