Here's the logic of the few changes that were made: Starfield of Nyx is a great card against control decks and can close out a game out of nowhere
The Break mechanic introduced in Breakthrough allows for fine-tuning strategies by adding evolution qualities to existing cards, while standard cards like Remoraid and Octillery also have a place in competitive play
With enough mana, you can create big flying dragon tokens
This can be quite helpful since you can see what card youre going to draw next, and you can see what card your opponent is going to draw next
Bitterthorn, Nissas Animus, Currency Converter, Drumbellower, Emeria, the Sky Ruin, and Moonshaker Cavalry are all double digit valued cards, and the land base is surprisingly solid, although if you wanted to add some more fetch lands it would make sense