With all the warring factions on Ixalan, the Immortal Sun hops around like a hot potato, but possessing it even briefly leaves you forever changed
When youve equipped a creature with this artifact you can then pay a further 2 mana and tap the creature
Two damage to each player with Niv-Mizzet, VisionaryNiv-Mizzet, Visionary in play will draw you six cards, which is not bad for three mana
Built-In Prize Support Collector Booster included for high-stakes bragging rights
Im sure there are a few more generically good Equipment which may be worth running in a list like this, but I think this is a great starting point: Overview of Tetsuo, Imperial Champion Tetsuo, Imperial Champion has an attack trigger tied to Equipment
This includes draw spells, repeatable draw engines, and looters, but not tutors (net zero card count), ETB cantrips (replace themselves but don't generate advantage), or combat damage triggers (too unreliable in multiplayer)