The Frost Crypts of Thyr

({t}: Add {u} or {b}.)
As The Frost Crypts of Thyr enters the battlefield, you may pay 2 life. If you don't,
it enters the battlefield tapped.
Sacrifice The Frost Crypts of Thyr: You
gain 1 life.
When The Frost Crypts of Thyr leaves your graveyard, add {u} or {b}.