Shadow of the Enemy

Exile all creature cards from target player's graveyard. You may cast spells from among those cards for as long as they remain exiled, and mana of any type can be spent to cast them.

As Frodo put on the Ring, Sauron was suddenly aware of the magnitude of his own folly. His wrath blazed in consuming flame, but his fear rose like black smoke.

The Lord of the Rings: Tales of Middle-earth

Shadow of the Enemy uses a new template indicating that you may spend mana as though it were mana of any type to cast the exiled cards. The six types of mana are white, blue, black, red, green, and colorless.

Snow mana is not a type of mana. Shadow of the Enemy won't let you pay a snow cost using mana produced by a nonsnow source.

You pay all costs and follow all normal timing rules for spells cast this way.