Mainly postig this here because its the only fun deck i created that is actually competitive(or i am extremely lucky games in dn).
Usually this deck is based around ophion which stops any lvl 5 or higher special summons and is also easily immune to most effects since i usually use his 1st material to get infestation pandemic infection.
Bahamut also helped me sometimes to win fast and otking by stealing and having 3 monsters to direct attack
And 2 level 4 evilswarm monsters is really easy to get with so much support, plus castor is insanely useful if you get him at the first turn
some monster effects are also insanely useful to destroy threats like big monsters or spell cards... i dont know why so many people dont play this deck though, evilswarm seem quite competitive at answering most threats