Vrost, Enchanted Overlord

When Vrost, Enchanted Overlord enters the battlefield, create a white Aura enchantment
token named Mask attached to it. The token has enchant permanent and totem armor.
As long as Vrost is enchanted, it's a legendary 1/1
white human noble with hexproof.
As long as Vrost isn't enchanted, it gets +X/+X,
where X is the number of enchantments you
control and has flying and trample.