Adoma, the Dreamscape

Enchant land you control
Enchanted land is a */* blue and white Spirit creature with "This creature's power and
toughness are each equal to the total mana value
of enchantments you control.", "When this
creature dies, draw two cards.", and "Sacrifice
this creature: Add {w}{u}". It's still a land.
Adoma, the Dreamscape can be your commander.