Rainbow Overdragon

-2: All Gem Beast, Advanced Gem Beast and Rainbow Dragon Creatures and Planeswalkers Gain Indestructible Until The End of the Turn.
-3: Any Damage You Take Until Your Next Turn Is Added To Your Life Instead.
-12: Gain An Emblem With: Any Damage You Take From Target Player,Gain That Life Instead. Rainbow Overdragon Can Be Your Commander.