Hixus was the latter
Each Room was an enchantment, much like Contraptions and Attractions were artifacts, with an effect on the game
Aeon Chronicler Barrowgoyf Chimney Goyf (playtest) Detritivore Entropic Specter Karn, the Great Creator Mordenkainen Overbeing of Myth Psychosis Crawler Sage of Ancient Lore Soramaro, First to Dream Sturmgeist Tishana, Voice of Thunder
You sacrifice an artifact creature to make two Treasure tokens with his first ability and then sacrifice a noncreature artifact to make two 1/1 Construct artifact creature tokens
Even when Lorwyn , the set planeswalkers were introduced in, came out, it took a long time for WotC to realize how they could harness the power of characters that we, the audience, could identify with, care about, follow, and learn from
"White, Blue, Black, for Part 1, and the rest for Part 2