Ryduter Hatchling

{g}{u}, Sacrifice Ryduter Hatchling: Put a 3/3 blue and green Dragon creature token with flying and " {g}{u}: This creature gains Dominance -- As long as you control a creature with power less than this creature's power, creatures you control gain hexproof until end of turn. Activate this ability only once per turn." onto the battlefield.
When that thing cracks... Run!