Anselm
The biggest problem with Anselm’s argument is the quality problem—i.e., how do we define greatness? And guess what it ends up being, thereby proving Nietzsche (and Schopenhauer) right? The urge at our centers, the Urgrund that, being drive, cannot be peered under, is nothing but the interest in power. Every drive-based entity has power as its interest, as the enabling interest necessary for all its other intentions.
So of course we schematize greatness as power, and power as existence.