Xion, Lost Memory

When Xion attacks, each opponent exiles a card
from their hand until Xion leaves the battlefield.
Xion get +1/+1 for each card exiled by her.
Once per turn you may cast a non-creature spell
exiled with Xion without paying it's mana cost if
it's converted mana cost is less than Xion's power.
"Who am I? What am I... here for?"