Miracle has NO creature control, NO permanent control. Give a Fractal RoL Hope deck a Time mark and an Eternity and you can beat Miracle without an Otyugh.
Sure, THIS deck can't do it without Oty. That's because this deck's strategy makes good use of Oty. Rainbows aren't everything. You'd be hard pressed to run that deck without the Bone Walls, they must be OP too. Or the Eternity. Or the quantum towers - seriously, every rainbow deck uses some quantum towers.
If you don't like getting your creatures eaten, I suggest you use bigger creatures. Maybe a flying Titan deck? Otyughs don't scare me, even if they have a little yellow infinity symbol in the corner.