God-with-attributes: Has properties needing ground
Platonic Forms: No creative capacity, has properties
Necessary Being: Essence is property
Quantum Vacuum: Within physics, not transcendent
Panpsychism: Experience ≠ creation
Mathematical Universe: No choice mechanism
Multiverse: More existence needing more grounding
Simulation: Infinite regress
Emergence: Within system, can't ground system
Brute Fact: Refuses to explain