Guardian Slime (1): Your primary playmaker, thanks to being played face-up on the field through the effect of the skill. Without your opponent having a response window, you will use it summon Egyptian God Slime, which triggers Guardian Slime's GY effect to search one of your 3 Spell Cards. Less importantly, should you open no combo starters, it can also be used to stall and survive effect via its Battle Phase summon effect.
Spell Cards:
The True Sun God (3): This card is a combo starter and your archetypal searcher - it lets you add any engine card from your Deck to your hand. Its other important effect lets you send an Immortal Phoenix from the Deck to the Graveyard, or itself (to be used if you already have a Phoenix in the GY) and then send the original Ra from your field to the GY, which triggers the Phoenix’s summon effect. Lastly, it has a third effect that prevents monsters other than Ra from attacking the turn they are Special Summoned (the Phoenix is unaffected by this effect). The search target of its first effect will usually be Ancient Chant if you this card is in your starting hand, Blaze Cannon if you search it via Guardian Slime, and in niche situations - Sphere Mode.
Ancient Chant (3): Your third combo starter, this card is a searcher for The Winged Dragon of Ra and thus your best way of getting it in your hand in order to use the second effect of the Skill. In addition to giving you access to Ra, Ancient Chant also provides it with an original ATK of 3000 - the original ATK of the Egyptian God Slime you will use as tribute material. You need to banish this card from the GY to gain this effect, so it can be stopped by GY disruption. On the plus side, this lingering effect applies to all of your The Winged Dragon of Ra Tribute Summoned during this turn, not just one - and Ancient Chant gives you to ability to make a second Tribute Summon during the turn you searched Ra with it.