If Scorpio casts deadly poison the turn before you KO him, GG without EM. Purify healing works on the opponent's turn, not yours.
the main point of casting purify 1-2 before KO is that the 'heal' counter will counteract poison counter cast afterward
given you need 2 purify to counter 1 imp.poison, its not much, sure but its worth a try
Electrocutor helps a lot with that, though it's true I'd pack 6 dragons. That's enough against Neptune most of the time, and they both have 2 Permafrosts.
Looks like a good deck, but would you risk decking out? If Scorpio gets a permafrost down, seems like it'd be a rough game.
hardly the case
while they both have permafrost, probability of seeing one in neptune is 4/72 whereas ~ scorpio is 4/108
but even if you see them early enough, unless you're really unlucky with the RNG you shouldnt have any problem to finish him off before decking out is an issue
and increasing the deck size goes against dim.shield chaining strategy as each additional card reduce the probability of seeing dim.shield even further
at most i'd go for 32-cards deck with 6 dragon but thats it