Versatile or staple cards are cards can be added to any type of deck and work even alon without combo.
Anit-meta cards are cards used to counter against very popular cards or decks in PvP matches. Adding 1 copy of an anti-meta card against a dominant deck sometimes works greatly.
Those cards can be actually seen in any type of decks. Having at least 1 copy of each is strongly recommended.
There are differences between speed duel format and rules applied to playing OCG/TCG. The rating above is made considering the formal of the game.
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Parasite Infestation Ver 2.0: deck recipe
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