Guild Supremacy

Shroud, Indestructible
If you control a permanent from each Ravnica Guild that is at least 2 colors at your end step then you win the game.
{t}{b/g}{b/r}{g/u}{g/w}{r/g}{r/w}{u/b}{u/r}{w/b}{w/u}: Search your library for 10 multi-colored permanents and put them onto the battlefield. This can only be activated at Sorcery speed.