Grimoire of Mystery

{t}: Gain 3 life.
{t}: Draw a card, then discard.
{t}: Reveal your hand. Scry 7, draw 7 cards, then double your life total. Exile Grimoire of Mystery. Activate this ability only if you are 20 life above your starting life total and only if cards in your hand have five different converted mana costs.
It always has more.