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Last edited: #6 @Pikachu6319 and @FourteenAlmonds covered it, kudos there

Vanitys Fiend in the Side Deck would catch opponent by surprise, especially since most players would be siding in Xyz Encore and would be unable to deal with Vanitys Fiend

Above is part of the price chart of Lyra Dawnbringer (a card that recently doubled in price based on it being underrated during spoiler season and on seeing heavy play in Standard)

4 Roaring Moon ex Can Knock Out Even the Strongest Pokmon Instant Knock Outs Are Appealing To Set Up Darkness-type decks have struggled to break into the meta after losing Dark Patch in the April 11 rotation, which deprived the decks of a way to reliably accelerate energy to their Pokmon