OP-06 introduced three major archetypes: Thriller Bark (led by Gecko Moria and Perona), Germa 66 (led by Vinsmoke Reiju), and Fishman Island (led by Hody Jones)
You can also drop zero cost cards, although I doubt anyone wants to play this so they can drop their Mana Crypt or Pact of the Titan
Another example is the loss of regular Pokmon with high HP and worthwhile setup attacks
and back then I think the idea was just to have 'horror' represent, well, Lovecraftian/Cthulhu monsters -- before M:TG began to use it as a stand-in for Phyrexian-corrupted monsters and a substitute for demon/devil
Appearances Special Mentions A couple of cards came very close to including Pichu in their artwork
At the other end of the scale, Necron Dynasties are all about recycling with Black decks that revive cards from the graveyard while the Tyranid Swarm revolves around Green decks that build up to enormous monsters