Wild-Magic Sorcerer — ruling 1

The first spell you cast from exile each turn will have cascade, even if it's not the first spell you've cast that turn.

Wild-Magic Sorcerer — ruling 2

However, if you cast a spell from exile and then later that turn Wild-Magic Sorcerer comes under your control, Wild-Mage Sorcerer won't give cascade to any other spell you cast from exile that turn.

Wild-Magic Sorcerer — ruling 3

If you control more than one Wild-Magic Sorcerer, the first spell you cast from exile will have that many instances of cascade, each of which will trigger separately.

Wild-Magic Sorcerer — ruling 4

If, while resolving the cascade ability from the first spell you cast from exile in a turn, you cascade into a second Wild-Magic Sorcerer, the spell will not cascade again.

Wild-Magic Sorcerer — ruling 5

A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions. For example, Wild-Magic Sorcerer's mana value is always 4.

Wild-Magic Sorcerer — ruling 6

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.

Wild-Magic Sorcerer — ruling 7

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.

Wild-Magic Sorcerer — ruling 8

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

Wild-Magic Sorcerer : règles, fonctionnement et interactions (MTG)

Wild-Magic Sorcerer is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

The first spell you cast from exile each turn has cascade. (When you cast your first spell from exile, 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.)

How it works : Wild-Magic Sorcerer

Original English text — Wizards of the Coast / Scryfall

#1July 23, 2021· Wizards of the Coast
The first spell you cast from exile each turn will have cascade, even if it's not the first spell you've cast that turn.
No other card is named in this ruling.
#2July 23, 2021· Wizards of the Coast
However, if you cast a spell from exile and then later that turn Wild-Magic Sorcerer comes under your control, Wild-Mage Sorcerer won't give cascade to any other spell you cast from exile that turn.
No other card is named in this ruling.
#3July 23, 2021· Wizards of the Coast
If you control more than one Wild-Magic Sorcerer, the first spell you cast from exile will have that many instances of cascade, each of which will trigger separately.
No other card is named in this ruling.
#4July 23, 2021· Wizards of the Coast
If, while resolving the cascade ability from the first spell you cast from exile in a turn, you cascade into a second Wild-Magic Sorcerer, the spell will not cascade again.
No other card is named in this ruling.
#5July 23, 2021· Wizards of the Coast
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions. For example, Wild-Magic Sorcerer's mana value is always 4.
No other card is named in this ruling.
#6July 23, 2021· Wizards of the Coast
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.
No other card is named in this ruling.
#7July 23, 2021· Wizards of the Coast
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.
No other card is named in this ruling.
#8July 23, 2021· Wizards of the Coast
If a spell with cascade is countered, the cascade ability will still resolve normally.
No other card is named in this ruling.
#9July 23, 2021· Wizards of the Coast
You exile the cards face up. All players will be able to see them.
No other card is named in this ruling.
#10July 23, 2021· Wizards of the Coast
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.
No other card is named in this ruling.
#11July 23, 2021· Wizards of the Coast
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.
No other card is named in this ruling.
#12July 23, 2021· Wizards of the Coast
Due to a recent 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.
No other card is named in this ruling.
#13July 23, 2021· Wizards of the Coast
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.
No other card is named in this ruling.