Glacial Temple

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

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

{t}, Pay 2 Life: Exert Glacial Temple: Add {u}{u} to your mana pool. (An exerted permanent won't untap
on your next untap step.)