Davriel, dark worldsoul

+2: look at target players hand. choose a card from it. exile that card
-4: exile target permanent or card in the graveyard. you may play that card and spend mana as though is was mana of any color.
-10: at the beginning of you upkeep, exile the top 3 cards of each players library. you may play cards from exile without paying their mana cost