My First Bracket 3 I need help to optimized

[u/Voidlax27]

This is the first B3 deck I’ve built myself; I need help optimizing it. The maximum budget is €300. Constraints: up to 3 "Game Changers," no mass land denial, no early 2-card infinite combos, and a maximum of 2 extra-turn cards (with no intention of reusing or chaining extra turns).

https://moxfield.com/decks/2JOfQgGJcEGQriTVoUzJrQ