The goal of this deck is to turbo out the egyptian god cards as fast as possible. This is a going second deck, you want to let your opponent set up and then clear their board with sphere mode/soul crossing.
Soul Crossing is the reason this deck works. It turns every god card into a sphere mode, except the monster starts out on your field immediately. Incidentally you can use it to summon Sphere Mode to your side of the field immediately and go straight into a 4000 Winged Dragon of Ra.
Pot of Extravagance and Prosperity are maxed out because other than Egyptian God Slime this deck doesn't use the extra deck at all, and we want to get to our combo pieces right away.
Ra's Disciple and Reactor Slime are the main way you can get 3 tribute fodder on the board. Reactor Slime also allows you to tribute it to set a Metal Reflect Slime directly from your deck.
Guardian slime and Metal Reflect Slime are the 2 cards used to bring out Egyptian God Slime, which can act as 3 tributes for the summon of a Divine monster, as well as being a respectable monster in its own right with 3000 atk/def and a redirection effect.
Ancient Chant and Thunderspeed Summon are how you're going to summon the god cards the same turn you get the materials on the field (other than Soul Crossing). Thunderspeed Summon also allows you to tribute summon on your opponents turn or during your battle phase. Ancient Chant lets you search for The Winged Dragon of Ra and gives you an extra tribute summon (you can summon a monster other than Ra if you want to). it also gives Ra an attack boost on summon, which is nice because you're normally bringing it out at 7900 making you just shy of an OTK.
Forbidden Droplet and Solemn Judgment are quality staples and I don't think I need to explain why they're good. Technically Judgment has negative synergy with Ra, but I think the negation is important. It's also the only Solemn that can be used after Ra resolves its effect.
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