First Arcanist, Thalyssra

: You gain an emblem with, "Whenever an opponent mills one or more cards put a +1/+1 counter on target creature you control."
+1: Create a blue Aura enchantment token named Mask attached to another target permanent. The token has enchant permanent, ward(3), and totem armor.
-4: Target opponent mills cards equal to the number of enchantments you control.