Quell the Calamity

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Until your next turn, your life total can't be
reduced and you gain hexproof. You gain 2 life for
each creature that convoked this spell.

Foretell {2}{w} (During your turn, you may pay {2} and exile this card from your hand face down.
Cast it on a later turn for its foretell cost.)