Sol'Is the Infinite Librarian

Flying, Indestructible
On your turn your library becomes your hand. At the end of your end-step shuffle your hand and cards in your graveyard into your new library and draw 7 cards.
{t}: Put Sol'Is into exile and at the end of your turn return Sol'Is to the battlefield tapped.
Oracle (Every turn look at the top card of your library, choose to: play that card, put it back on top, or put it on bottom.)