Celestial Envoy

Cast Celestial Envoy only if you control a card
named Issun.
Issun perpetually becomes legendary in addition
to its other types. Double the number of praise
counters on Amaterasu.
Foretell {1}{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.)