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It also doubles up with Mox Opal to put you into a range where you can reliably exploit early three mana turns

Meloetta takes 20 additional damage from Darkness-type attacks

This can come back to bite you against fast decks like Miraidon and in games where your Mirage Step Kirlia is among your Prizes, but the additional copies of cards like Fog Crystal are almost as good as Battle VIP Pass on turn 1 anyways, so it's not like you need to Mirage Step in 100% of games

Mega Genger ex's regular and Shiny variant brings the "Labyrinth of Shadows" attack, which deals 120 damage (requires 3 Dark energy and 1 Colorless energy) to opponents and prevents them from using any Trainer cards on their next hand

Setup & Rulebook Shuffle and deal, thats it