No, not talking about Miserix, we still have quite a few years to go before getting to that guy. The Makuta in question here is the one and only who was released as a Ritual Monster in BCOR:
Now this particular form of the master of shadows is certainly a bit too small to qualify for the “Kaiju” title, but of course that term here refers to the actual archetype. Those are high-level monsters summoned to your opponent’s field by tributing one of their monsters, and if you add to that Makuta’s ability to return high-level monster to the hand when he is summoned, the bit of synergy that prompted this deck idea should be quite apparent.
(The above deck is also included in the new BYE release for EDOPro as BYE_Makuta)
Basically, you want to use Makuta to clear the field of monsters, and to do that you have to make sure as many of your opponent’s monsters as possible fulfill the condition of being at least Level/Rank 5.
Back in ze day, the trick to doing that was the Mangaia Field Spell, which can increase Levels and Ranks by up to 4 by self-milling. It also serves as a searcher for Makuta or his Ritual Spell and protects them from negation, so using this was usually enough to get pretty much anything off the field. Until Link Monsters came along, because those have neither Levels nor Ranks to be increased and so literally do not care about any of this. They can, however, still be tributed for Kaijus, so that’s a convenient way to fill that gap.
Once you have successfully summoned and resolved Makuta, he can tribute himself to summon a Rahi from anywhere, ideally going into some big Synchro for a quick win. Failing that, his Ritual Spell does allow summoning him once more from the GY, so that can still give you a second chance (remember, any Kaijus you used before will also be back in your hand ready to go again!).
Some additional interesting inclusions in this deck are the Ritual Djinns, which can be used as material for a Ritual Summon while in the GY and thus go well with Mangaia’s milling effect. Cherubini can send not only those directly to the GY, but also any of the Level 3 Rahi to trigger their effects, and Cross-Sheep gives you one of its better effects for summoning a Ritual Monster, which the Makuta Ritual Spell conveniently does twice. Finally, if you’re wondering why the deck uses specifically Gadarla as part of its Kaiju lineup, that’s because some genius thought it made sense to let the Kewa search every single WIND monster. Very balanced.