Omega Nebula

Star Formation-{w}{u}{b}{r}{g} As an additional cost
to use this ability, discard two cards, then create
a Star token (Star tokens are artifacts with "{t}: add
2 mana of any color to your mana pool"
Star Forming Gravity-{w}{u}{b}{r}{g} [Shuffle your graveyard into your library then] draw a card,
then lose 1 life for every 2 mana in that card's
mana cost, if you have 15 or fewer cards in your graveyard, remove the words in brackets