Obsidian Library

{t}: Shuffle a card from your hand into into your library. Then reveal the top card of your library and add one mana of any colour to your mana pool. Draw a card.
{7}: Sacrifice Obsidian Library: Shuffle any number of cards from your hand into your library, then draw a card and add one mana of
any colour to your mana pool for each card shuffled into your library this way.