"Occult Archfiend" Deck 2019

Playing

Reconstructed because I misunderstood the effect ruling. By using "Fiendish Rhino Warrior" as the cost of "Dark Spirit's Mastery", you can send "Archfiend Heiress" to his GY and actually have two search & GY fertilizers.

Strength

By summoning more and more superlative Fiends of level 8, you can overwhelm them. If the virus card works well, you can shred your opponent's development, and you can continue to attack unilaterally.
You can fertilize his GY with "Trade-In" and draw acceleration, and you can also line up with "Dark Necrofear" and "Curse Necrofear" on the first hand.

Weakness

Since he relies on using GY, his natural enemy is to block GY. Also, since there is no general-purpose Fiend in Rank 8, where the level is matched, his Fiend binding of 《Archfiend Emperor, the First Lord of Horror》hurts.
Using hand triggers from the side deck can help to some extent, but failing to get rid of troublesome cards can quickly become a pain.
Of course, since there are many superlatives, hand accidents are friends.

Customize

It might be a good idea to adopt 《Pot of Extravagance》and divide the extra deck from the beginning with the draw cost. If you use 《Shapesister》, you can add synchro and link gimmicks (maybe?) while leaving a bit of a bummer.