Molten Memorial

As Molten Memorial enters the battlefield, you may pay 2 life. If you don't, Molten Memorial enters
the battlefield tapped.

{t}: Add {r} to your mana pool.

{t}, Pay 2 Life: Exert Molten Memorial: Add {r}{r}
to your mana pool. (An exerted permanent won't untap during your next untap step.)