There aren't any major rules that are unique to Artifacts, but many cards care about the number of Artifacts you control, or can only target Artifact permanents
There are a few at various levels of damage that target both creatures and players, which can maximize your triggers in a burn deck
The Fallout line-up is here as the latest Universes Beyond crossover, and, like the Doctor Who set, its all contained within a handful of Commander decks
This means that Lugia VSTAR will tremble in your presence
Ravnica: City of Guilds was so well received that it engrained factions as a structural tool that we would use again and again, now using it about once a year
Steelix is a memorable Pokmon for its incredible size, and it is a special evolution of Onix, but it's hardly known for being aesthetically pleasing