Snap

(You can't cast this spell unless you control a legendary creature or planeswalker.)
Exile half the creatures on the battlefield. Bring 3 creature cards from you graveyard back to the battlefield. You may only cast spell if you control all infinity stones.
{u}{b}{r}{g}{w}{1}{e} As you cast this spell you may pay this extra cost. If you do search your library and or graveyard for up to 3 infinity stone cards. Put them onto the battlefield.