Quasar, Celestial Archon

+2: Until your next turn, Quasar becomes a 5/5 Avatar creature with flying, hexproof, and vigilance that's still a planeswalker.
-2: Create a tapped colorless artifact token called Singularity with "{2},{T},sacrifice: Destroy all artifacts, creatures, and enchantments.
-10: Each player gets an emblem with "You control the turn of the player to your left. If that player would win or lose, you win or lose instead."