Cassie, Queen of Zelthorn

Cure, vigilance, first strike
Whenever you cure a creature or player, exile the
top card of your library. You may cast that card for
as long as it remains exiled and you may use mana as
if it were mana of any color.
Whenever you cast a non-permanent spell from
exile, shuffle it into your library after it resolves.
Otherwise create a 1/1 white Soldier creature token.