Even if they activate E-con, Daedalus' effect has already been activated, so even though your opponent won't be able to attack, you still won't be able to defend next turn, unless your hand is hiding strong defense that you didn't set
I mean, yes it's a pretty bad deck, but not because it's weak to E-con. It's bad because you can easily brick and it has low consistency and it's not as fast as most meta decks. That said, I don't think many people who'd want to play this deck are looking for a top tier deck, just a viable way to play Levia Dragon with Ocean Dragon Lord just for fun, if they happen to like the card.
Somewhat true, it seems that the OCG has better options with this deck(Codarus increases the deck's efficiency, draw power can also be increased, etc.)
Io ho fatto un deck con neo Legia dragone Dedalo però è diverso da questo e per far girare le carte infetta ho messo carte come tartaruga don, rana barbuta e piccola grande onda. Poi come uno ho messo Lemuria