what is a set card in yugioh PSA Registry: Collecting the Classic 2002 Yu-Gi-Oh!: Magic Ruler (MRL) Trading Game Set their family An image to explain how

GR Gold Rare Hot Red Dragon Archfiend Bane X DARK Level 10 [ DragonSynchroEffect ] ATK 3500 DEF 3000 1 Tuner + 1 non-Tuner DARK Dragon Synchro Monster You can Tribute 1 monster, then target 1 "Red Dragon Archfiend" monster in your GY

They were also worth three Prize cards when Knocked Out by your opponent, so as satisfying as they were to use, they did come with an extra risk

1 K every Yu-Gi-Oh

(If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand

However, it was never a widespread staple, so the alt arts price wasnt significantly driven by players needing it (and they could use normal versions anyway)