Davriel Cane

+1: Create a black 1/1 Imp creature token with flying.
-3: Target opponent reveals their hand. You add one spell from their hand to your hand and may cast it as though your mana was mana of any colour.
-8: You get an emblem with "Your opponents play with their hand revealed" and "you may cast spells from your opponents hands with mana of any colour"