legendary yugioh cards Yu Gi Oh Collection Ultra Rare God Card Set of 3 Egyptian God Slifer, Obelisk Ra (Limited Edition) Ultra Rare Version : Toys & Games and more (recently reprinted in Battles of Legend Yu-Gi-Oh! Trading Card Game: Legendary
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(compiled from various sources such as TCGPlayer, Collectr, Pricecharting, etc.) If you're interested in the full list of Secret Rares from Mega Evolution Base, you can check them out here
The promotional cards feature exclusive designs

Pokemon Card Japanese Brock's Scouting 096/100 sv9 TCG

Its at this point that the hobby sort of crosses over into gambling

While mostly aesthetic, Dark and Light Pokmon are highly collectible because they were only present in a few sets throughout the TCGs lifetime
