Tome of the Omnipotent

Whenever a spell or ability you control counters a spell, you may pay {1}{u}. If you do, draw X cards, where X is the converted mana cost of the countered spell.
{1}{u}{u}: Return up to one instant from your graveyard to your hand, then discard a card. Activate this ability only any time you could cast a sorcery and only once each turn.