the strategy is quite simple, it consist in summining chaos ruler and byits effect milling a tuner thet you can special summon form the GY, then you go for halqifibrax and get plaguespreader, during your opponent turn use the effect of halqifibrax synchro summmon formula synchron,draw a card and use his effect tu summon king calamity, your opponent won't be able to do much after that and you can go for the OTK
in addection to dhis combo if you mill spell canceller you can use chaos ruler and plaguespreader for baronesse de fleur then you re-special summon form the GY both Chaos ruler and plaguespreaderand pass, during your oppo standby phase you'll be able to summon spell canceller by returning baronesse de fleur in the extra deck and keep going for king calamity as explained before.
if you want you can sunìb to my YT channel, here the cards list video:
https://youtu.be/ctCSJZ3uf58 (not out before 10:00 am in Italy)
(upcoming the duel video of this deck profile)
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