Draugr Necromancer

If an opponent controls a nontoken creature that you own and that creature would die, it will be exiled with an ice counter on it. However, you won’t be able to cast that card from exile.

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.

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.

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.

Draugr Necromancer allows you to cast spells from among any cards in exile your opponents own with ice counters on them, including cards that were exiled by previous Draugr Necromancers.