Gronk the enchantress

At the beginning of your upkeep search your
library for an aura and exile it, you may may cast spells exiled this way as long as they remain
exiled, and you may spend mana as though
it was mana of any color to cast those spells.
Whenever an aura is attached to Gronk, creatures
your opponents control get -1/-1 until end of
turn.