Berg Strider — ruling 1

Spending more than one snow mana to cast Berg Strider won’t cause the artifact or creature to remain tapped for additional turns.

Berg Strider — ruling 2

The enters-the-battlefield ability can target an artifact or creature an opponent controls that’s already tapped. If snow mana was spent to cast Berg Strider, the target won’t untap during its controller’s next untap step.

Berg Strider — ruling 3

If Berg Strider enters the battlefield without being cast, no mana was spent to cast it. The enters-the-battlefield ability may still tap the target, but that permanent won’t be stopped from untapping during its controller’s next untap step.

Berg Strider — ruling 4

Similarly, if an effect copies the creature spell that becomes Berg Strider, no mana was spent to cast the copy. The target won’t be stopped from untapping during its controller’s next untap step.

Berg Strider — 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.

Berg Strider — 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.

Berg Strider — 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.

Berg Strider — 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.

Berg Strider : règles, fonctionnement et interactions (MTG)

Berg Strider 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

When this creature enters, tap target artifact or creature an opponent controls. If was spent to cast this spell, that permanent doesn't untap during its controller's next untap step. ( is mana from a snow source.)

How it works : Berg Strider

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
Spending more than one snow mana to cast Berg Strider won’t cause the artifact or creature to remain tapped for additional turns.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
The enters-the-battlefield ability can target an artifact or creature an opponent controls that’s already tapped. If snow mana was spent to cast Berg Strider, the target won’t untap during its controller’s next untap step.
No other card is named in this ruling.
#3February 5, 2021· Wizards of the Coast
If Berg Strider enters the battlefield without being cast, no mana was spent to cast it. The enters-the-battlefield ability may still tap the target, but that permanent won’t be stopped from untapping during its controller’s next untap step.
No other card is named in this ruling.
#4February 5, 2021· Wizards of the Coast
Similarly, if an effect copies the creature spell that becomes Berg Strider, no mana was spent to cast the copy. The target won’t be stopped from untapping during its controller’s next untap step.
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.