Icebreaker Kraken — ruling 1

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Icebreaker Kraken). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.

Icebreaker Kraken — ruling 2

Icebreaker Kraken's enters-the-battlefield ability won't tap any artifacts or creatures.

Icebreaker Kraken — ruling 3

No artifacts or creatures controlled by the player affected by Icebreaker Kraken's enters-the-battlefield ability will untap during that player's next untap step, even if they were untapped as the ability resolved or that player didn't control them at that time.

Icebreaker Kraken — ruling 4

Once you announce that you're activating the last ability, no player may take actions until the ability has been paid for. Notably, opponents can't try to stop you from activating it by removing your snow lands.

Icebreaker Kraken — ruling 5

Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.

Icebreaker Kraken — ruling 6

The {S} symbol is a generic mana symbol. It represents a cost that can be paid by one mana that was produced by a snow source. That mana can be any color or colorless.

Icebreaker Kraken — ruling 7

Snow isn't a type of mana. If an effect says you may spend mana as though it were any type, you can't pay for {S} using mana that wasn't produced by a snow source.

Icebreaker Kraken — ruling 8

Some cards have additional effects for each {S} spent to cast them. You can cast these spells even if you don't spend any snow mana to cast them; their additional effects simply won't do anything.

Icebreaker Kraken : règles, fonctionnement et interactions (MTG)

Icebreaker Kraken 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

Affinity for snow lands (This spell costs less to cast for each snow land you control.) When this creature enters, artifacts and creatures target opponent controls don't untap during that player's next untap step. Return three snow lands you control to their owner's hand: Return this creature to its owner's hand.

How it works : Icebreaker Kraken

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Icebreaker Kraken). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
Icebreaker Kraken's enters-the-battlefield ability won't tap any artifacts or creatures.
No other card is named in this ruling.
#3February 5, 2021· Wizards of the Coast
No artifacts or creatures controlled by the player affected by Icebreaker Kraken's enters-the-battlefield ability will untap during that player's next untap step, even if they were untapped as the ability resolved or that player didn't control them at that time.
No other card is named in this ruling.
#4February 5, 2021· Wizards of the Coast
Once you announce that you're activating the last ability, no player may take actions until the ability has been paid for. Notably, opponents can't try to stop you from activating it by removing your snow lands.
No other card is named in this ruling.
#5February 5, 2021· Wizards of the Coast
Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.
No other card is named in this ruling.
#6February 5, 2021· Wizards of the Coast
The symbol is a generic mana symbol. It represents a cost that can be paid by one mana that was produced by a snow source. That mana can be any color or colorless.
No other card is named in this ruling.
#7February 5, 2021· Wizards of the Coast
Snow isn't a type of mana. If an effect says you may spend mana as though it were any type, you can't pay for using mana that wasn't produced by a snow source.
No other card is named in this ruling.
#8February 5, 2021· Wizards of the Coast
Some cards have additional effects for each spent to cast them. You can cast these spells even if you don't spend any snow mana to cast them; their additional effects simply won't do anything.
No other card is named in this ruling.
#9February 5, 2021· Wizards of the Coast
The Kaldheim set doesn't have any cards with mana costs that include , but some previous sets do. If an effect says such a spell costs less to cast, that reduction doesn't apply to any costs. This is also true for activated abilities that include in their activation costs and effects that reduce those costs.
No other card is named in this ruling.