Intellect Devourer

Devour Intellect—When Intellect Devourer enters
the battlefield, each opponent exiles a card from
their hand until Intellect Devourer leaves the battlefield.
Body Thief—You may play lands and cast spells
from among cards exiled with Intellect Devourer. If you cast a spell this way, you may spend mana as
though it were mana of any color to cast it.