"Dark Spell Regeneration" and "Millennium Revelation" covers "Ra's" ability to be Special Summoned, like any other Egyptian Gods, while "Ra" by itself cannot be Special Summoned in the OCG / TCG
Viviens threat sounds more lawful by comparison, but its the placement of that new paragraph that gives the utterance of Withdraw such power
While Im not sure how often thats going to come up, Tractor Beam is still quite a bit better than your usual blue removal and likely a very strong card in EOE Limited
How likely are you to see 1 copy of Brilliant Fusion on your first turn, knowing that you're going second
C Common Abyss Actor - Wild Hope X DARK Level 4 [ FiendPendulumEffect ] ATK 1600 DEF 1200 P Scale 2 Once per turn: You can target 1 "Abyss Actor" card in your other Pendulum Zone
Throne of the High City may also be a help in decks that are really hurting for card draw, like Mono White lists