Glorious Sun’s call cost requires you to have a 20+ life advantage over your opponent. You can achieve this by offensively hitting your opponent with player attacks, or defensively gaining life over time. Change your strategy based on the matchup!

Playing offensively can be enabled with cards like Crying Tree and Giant Ent. Enchant one of them with Kudzu, then cast Nature’s Grace to immediately give it 4 more strength while gaining 4 life!

Playing defensively works well with cards like Moonlight Flower and Circle of Life. Cast a Raise Dead on a Circle of Life to return summons from your graveyard to your castle, place a summon on your battlefield, and gain life while doing so! You can chain Circle of Life’s ability with another copy of it in your graveyard as well!

Keep an eye out for your bigger spells to seal the game, such as Blessing of Greatness being used to pierce through a summon to hit the opponent with the excess damage, or Bulk Up to outlast an opponent’s resources.