Arisen, Heretical Summoner

Flash
Whenever Arisan, Heretical Summoner enters
the battlefield, look at the top three cards of your library. Reveal a card from among them and put
it in your hand. Shuffle the rest into your library.
{1}{u}{b}{r}{g}, Discard a land: Shuffle your hand
into your library and draw that many cards.
{2}{w}{u}, Discard a card at random: Return Arisan
to your hand and draw a card.