Annihilation Tome

Whenever a player casts a spell, exile another permanent you control or a card from your hand.
Hellbent - As long as you have no cards in hand, if you would draw a card, instead draw two cards
and lose 1 life.
Barren - As long as you control no other permanents, once each turn, you may pay {0} rather than pay the mana cost for a spell you cast.