Sanvili, City of Fog

When Sanvili, City of Fog enters the battlefield, each player must return a land they control to thier respective hands or take 2 damage
{t}: Add 2 of {w},{u}, or {b} to your mana pool
"One of the ten Beacon Cities, some time back it was cursed by a powerful monster. I have been working to lift the curse on my home city, but I belive it needs the type of monster who cursed it. And we don't know what it was." -Dragos Zalken