Its evolution into Blissey added to its appeal, as players sought the high HP and Special Defense it offered, especially in later games where its defensive capabilities became a linchpin in many competitive strategies
Even if it proves to be a bit inefficient for Standard, this card has Commander written all over it
This might end up being a little too conditional for cEDH, but for those willing to run tutors in casual, this is fairly acceptable, especially for a Demon-themed deck
Body of Knowledge and the Maro cycle of legendary spirits from Saviors of Kamigawa have power and toughness that rely on the number of cards in your hand, another reason to want a mittful of cardboard
Basically, take any other archetype you can think of, slap artifact onto its name, and you have a viable sub-archetype