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You can only use 1 "Spright Gamma Burst" effect per turn, and only once that turn
Thats 100 DMG to a Celebi EX being built on a Grass deck and even in general, 80 DMG KOs many Benched cards or those EX cards withdrawing to the Bench to stay alive
Much of the removal in Modern Horizons is slow or clunky, so having a cheap, disruptive threat that synergizes super well with ninjas and blink while being outstanding by itself makes it a top tier common
There are plenty of ways to acquire these codes without having to buy hundreds of packs on your own and redeeming a lot will give you plenty of cards to start building your decks with
The combination of mana cost, stats, enchantment typing and two powerhouse abilities make this almost as universal as Setessan Champion, and four of each is a decent place to start green Standard lists if you want to do anything with enchantments going forward