(This process may be accomplished by shuffling 1 copy of each leveled card in your collection together.) (Official FAQ v2.4, July 2025) Subject 5U-21 The Anomaly Investigator Manifold
Pikachu ex up 109%, Mega Charizard Y down 36%
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Fantastical Dragon Phantazmay X DARK Level 7 [ Dragon / Effect ] ATK 2400 DEF 1800 If your opponent Special Summons a Link Monster(s) (except during the Damage Step): You can Special Summon this card from your hand, draw cards equal to the number of Link Monsters your opponent controls +1, then shuffle cards from your hand into the Deck equal to the number of Link Monsters they control
There are also a lot of possibilities for variation based on the number you choose
I think the best places for a planeswalker are in midrange and control decks, since their main strength lies in gaining incremental advantages over the course of a game