Hope Burning Bright

At the beginning of your upkeep, you gain 3 life.
Exile two white legendary creatures you control each with converted mana cost 4 or greater: Exile Hope Burning Bright, then return it to the battlefield transformed.
"Great Akiraia, we beseech thee in our ultimate time
of desperation and need.
Let us survive this darkest night, and prevent the death of eternity."