booster box mega evolution Evolutions Opening : r/PokemonTCG Mega Evolution—Chaos Rising expansion Pokémon TCG: Mega Evolution Enhanced

The "Power 9" (like the Black Lotus) offered such unfair advantages they were banned from competition

More details on that are yet to come

When he is good he is unreasonably good, making 5/5 fliers for no mana or life cost, just tapping some dorks, is hard to beat

Furthermore, its previous evolution is an incredibly consistent draw engine that allows it to maintain advantage throughout the game

Note: Each Build & Battle Box Code gives you 1 of the 4 promo cards from this set and several other playable cards

Good news is that it seems to be difficult to do with modern packs and probably most difficult with SV era due to multiple foils per pack