A-Midnight Assassin

Song —You may cast this spell only if you control an Elf, Human, Vampire, or Dryad. When Sun Song enters the battlefield, you may pay 3 life. If you do, Sun Song deals 3 damage to any target. {X}{R}{R}, Sacrifice Sun Song: Sun Song deals X damage to any target. If X is 5 or greater, it deals X damage to each player and each creature instead. Activate only as a sorcery.