the Chimera cards encourage mixing Illusion monsters with Beasts and Fiends, retrains (such as "Golgoil the Steel Seismic Smasher") will support both Illusion and their original Type, and various cards (both OCG / TCG -original and from the anime/manga) also support Spellcasters
However, being able to essentially block damage altogether, from what tend to be the most powerful Pokmon in the game, is a very intriguing twist, and basically elevates the use of single-prize, standard Pokmon cards
Each mythos pack is numbered from 1 to 6 and if you go on ArkhamDB you can look at the cards tab to see the name of each pack and in what order it was released
It first appeared in Dark Phantasma [S10a], with a new design later appearing in Terastal Festival ex [SV8a]
While the most famous of these cards are Dark Magician and Dark Magician Girl, they weren't the only ones, and he used plenty of other magician cards to take down his opponents
AxelSP didn't specify the playstyle for this deck