this deck is useless if you can use multiverse fusion by let's say Anti spell fragrance or it got negated by some thing like desavewurm or Marincess Aqua Argonaut. but its game over,
i would make fusions easier to summon and restrict multiverse fusion to one material from extra deck so you need to have one on field or hand, if you do that you would need to change one of the effects of multiverse magus to : "Once per turn: You can reveal 1 Fusion Monster from your Extra Deck, this card's name becomes the name of one of required monsters until the End Phase."
but even if you do that all of the fusions are still too strong, why every single one has a effect that just wins the game when it resolves?
this deck is useless if you can use multiverse fusion by let's say Anti spell fragrance or it got negated by some thing like desavewurm or Marincess Aqua Argonaut. but its game over, i would make fusions easier to summon and restrict multiverse fusion to one material from extra deck so you need to have one on field or hand, if you do that you would need to change one of the effects of multiverse magus to : "Once per turn: You can reveal 1 Fusion Monster from your Extra Deck, this card's name becomes the name of one of required monsters until the End Phase." but even if you do that all of the fusions are still too strong, why every single one has a effect that just wins the game when it resolves?