Chaos Necromancers effect doesn't work correctly. It's attack should be the amount of monsters in grave *300 and it can't be changed without an owerwriting effect(like:until end of the turn) or a continues effect or an equip card. Any effect that lower or boost it permanently or temporarily but aren't continues should be owerwritten and restored by chaos necromancers ability.
Combo with Wrecker Panda with Mai's Aurora ability or Heart of the Underdog & Wonder Balloons, Pot of Dichotomy or Jar of Avarice to return Chaos Necromancer (and other cards) to your deck in the event it's destroyed. If you'd really like to get under your opponents skin, add Solemn Wishes to option two.
So basically with low draw insect type + magical merchant + bus from underground + 27 (non-insect type) monster cards.. its probability are pretty high i think all i need is away to avoid attack being cancelled and away to end it please test and replay.
I was thinking along these lines too after I saw it in the trader. Somehow deck could self-mill itself to one resurrect spell and swing for lethal 10,000 dmg. Farm alternative that doesn't need to play out every turn to get to last card and max dmg. Would need to have bug and fiend in-hand somehow with only destiny draw tech and creatures.
I figured it out but I lack some cards all I need is 3 caos necromancer 3 tour bus to underworld 1 magical merchant aweivel's low draw and bunch of monsters but you'll only have 1 to 3 chances to end this game since you'll only have 1 to 3 caos necromancer in your deck due to tour bus's trigger effect easy win but lack of cards... I just need to test it