At Cullens of Surrey Auctions, we regularly deal with a wide range of trading card collections from Pokmon to Panini, and everything in between
The early YGO games that came out were more or less Konami experimenting with what kind of ruleset they wanted their card game to have
There Is No Kill Like Overkill: Standard Finishing Move procedure in the later parts of the series seems to be buffing a monster up to five-digit ATK and then using it to destroy the opponent's ace monster while killing them several times over
BPhillipYork: Neato, fits nicely into these themes of playing artifacts for energy, especially if you use eggs (the series of artifacts that do something on cast/enter and leaving the battlefield) and pair it with cost reduction
Blood Moon, Relic of Progenitus, Nihil Spellbomb, Ancient Grudge, Timely Reinforcements, Leyline of the Void and Leyline of Sanctity, and even Fulminator Mage are all well-known as proper answers to some of the poles of the format, with a time and a place for each of them in the right metagame
Examples include Yuriko, the Tiger's Shadow as Yuffie Kisaragi and Ancient Copper Dragon as Final Fantasy I's Dragon of Mount Gulg