Arlise, the Flood Queen

Arlise, the Flood Queen costs {1} more to cast for each card in your hand.
Flying, hexproof
You have no maximum hand size.
As long as you have 8 or more cards in your hand, Arlise, the Flood Queen gets +2/+2, gains indestructible and "Whenever you cast a creature spell, discard a card."