Noise Marine — ruling 1

The spell you cast due to cascade resolves before Noise Marine, so when its enters-the-battlefield ability resolves it will count that spell as a spell you've cast this turn.

Noise Marine — ruling 2

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

Noise Marine — ruling 3

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.

Noise Marine — ruling 4

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.

Noise Marine — ruling 5

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

Noise Marine — ruling 6

You exile the cards face up. All players will be able to see them.

Noise Marine — ruling 7

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.

Noise Marine — ruling 8

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.

Noise Marine : règles, fonctionnement et interactions (MTG)

Noise Marine 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

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.) Sonic Blaster — When this creature enters, it deals damage equal to the number of spells you've cast this turn to any target.

How it works : Noise Marine

Original English text — Wizards of the Coast / Scryfall

#1October 7, 2022· Wizards of the Coast
The spell you cast due to cascade resolves before Noise Marine, so when its enters-the-battlefield ability resolves it will count that spell as a spell you've cast this turn.
No other card is named in this ruling.
#2October 7, 2022· 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.
No other card is named in this ruling.
#3October 7, 2022· 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.
#4October 7, 2022· 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.
#5October 7, 2022· 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.
#6October 7, 2022· 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.
#7October 7, 2022· 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.
#8October 7, 2022· 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.
#9October 7, 2022· Wizards of the Coast
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.
No other card is named in this ruling.
#10October 7, 2022· Wizards of the Coast
Two new cards in this set give the next spell you cast cascade. This means that the next spell you cast gains cascade as you begin to cast it by putting it on the stack, and the cascade ability will trigger when you finish casting that spell.
No other card is named in this ruling.