Shrine of Vaermina

Hexproof
At the beginning of your upkeep, each player
discards a card. Each opponent who can't exiles
top three cards of their library face-up.
Pay 5 life: Until the end of turn, you may cast a
card exiled with Shrine of Vaermina, and you
may pay mana as if it was mana of any color to
cast this spell.