Draviel, the Spellthief

+1: Discard a card if you can, look at the top card from target oponent's library, exile that card with a Spellthief Counter on it.
-1: Cast a exiled card with a Spellthief Counter on it, spend mana as though it were mana of any type to cast that spell.
-8: You get an emblem with "As long as you control a "Draviel, the Spellthief" everytime a opponent casts a instant or sorcery spell, copy it."