Hey, thanks for the extensive feedback!
Sneak Attack is a great addition to the deck.
I would then add
Eternal Witness and
Noxious Revival to the deck as additional support. This would allow me to get back important dragons that have not yet been able to be copied.
I have now added an extra land to the deck with
Stomping Ground.
Your point about
Electrodominance is moot, as it's not really a instant or sorcery spell in the deck that's worth including.
And I like the
barbarian class, because it gives me the possibility to improve the dice result with
Ancient Copper Dragon and
Ancient Bronze Dragon. Additionally, the class can be played quite early.
Rhythm of the Wild is also a good alternative.
You did a good job of analysing the strategy for the deck.
With
Thrasios, Triton Hero,
Herald's Horn,
Oracle of Mul Daya and
Sylvan Library there are good synergies, as Thrasios allows me to Scry 1 beforehand and thus control the library well.
I have now rebuilt it a little with your input.