yu gi oh structure deck Yu-Gi-Oh: Deck: Legend of the Crystal Beasts Playmat – Card Monster Games have addition to any duelists arsenal Yu-Gi-Oh! Legendary 5D's Decks

There are also legends that dont directly call out X-spells but offer the kind of cost reduction that facilitates playing X-spells way more easily than normal

All the might of Phyrexia was no match for this new, cuddly threat. Thats not even subtext

2 Pokmon TCG: 30th Celebration booster packs 1 Sticker sheet A Pokmon art card showing the art from this Mini Tinyou can collect and combine all 10

As an indestructible enchantment which can become a creature, Nylea's pretty good in any version of that deck focused on enchantments

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I don't believe either of those rules are in contention for the top spot of "old rules that would still be be sweet to use in oldschoolmtg", but that is a fully different post