Titan Ruins

Titan Ruins enters the battlefield tapped.
When Titan Ruins enters the battlefield, return
a land you control to its owner's hand, then you
may pay {1}. If you do, each opponent loses 1 life
and you gain 1 life.
{t}: Add {r}, {w}, or {b}.
Whenever Titan Ruins is tapped for mana,
add {c}.