No, its not the addition of Mega Evolutions via a set of new Mega Rising booster packs
Youll be gaining lore and locking things down all at the same time
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It's theoretically possible that, if you were to weigh literally thousands of packs to choose your heavy favorites, and bought hundreds of them, you might get a slightly higher pull rate of rare cards than if you bought the same number of random packs - but I don't recommend it, for two main reasons: Most game stores don't permit you to weigh individual booster packs before buying them - mostly because it takes a long time and holds up the line
Voracious Hydra Having an immediate effect when entering the battlefield is a good way to be playable in Constructed, and Voracious Hydra has it