Adaptive Enchantment

Adaptive Enchantment is a 100-card Commander precon from Commander 2018, released August 10, 2018. It is led by Estrid, the Masked, a Bant commander.

Estrid, the Masked

[+2]: Untap each enchanted permanent you control.
[−1]: Create a white Aura enchantment token named Mask attached to another target permanent. The token has enchant permanent and umbra armor.
[−7]: Mill seven cards. Return all non-Aura enchantment cards from your graveyard to the battlefield, then do the same for Aura cards.
Estrid, the Masked can be your commander.

The list runs 39 lands and 25 creatures, and its nonland cards average 3.90 mana. At today's TCGplayer prices the whole deck's cards come to about $74.77, and the most valuable is Bear Umbra at $12.63.