Arceus, The First One

Indestructible. Hexproof. Shroud. Menace. If you
paid less than 25 mana to cast this card, lose the game.
Whenever Arceus, The First One attacks,
look for any Creature card in your deck, give it
Indestructible and Hexproof, then shuffle your deck.
Whenever Arceus, The First One leaves the battlefield,
all other cards you have played and will play for the rest
of the game gain Flash, cost {0} and can be cast from anywhere.