Throes of Chaos

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

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

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.

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.

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.

Throes of Chaos does nothing as it resolves. All of its chaos happens before it resolves.

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.