traditional yugioh decks Yu-Gi-Oh! Labyrinth of Nightmare (2003) LON Complete Set 105/105 Yu-Gi-Oh! Pegasus Starter Deck (2003)

Magical Refpanel, while not that old, reads like a classic Yu-Gi-Oh

Its interesting that or planeswalker has become such common parlance on common cards, even in a core set that doesnt have an uncommon planeswalker like Chandra, Novice Pyromancer

High-End Foils And Promos Early foils, judge promos, old promotional cards, and rare event cards can also be expensive

Gotta measure 'em all

Not only is this effective at mitigating any battle damage you might have taken from combat (though that's also hard since Ni-Ni takes no battle damage and reflects damage back), but it blocks any combos your opponent might have been planning with their monster for their turn