Demogorgon of the Deep

Deathtouch, Reach, Trample
You may return a card you own in exile to your graveyard to pay for one mana of any color when casting this card from the command zone.
This creature's power is equal to the number of
cards you own in exile.
When you cast a spell with Madness, each
opponent loses 1 life and discards a card at
random.