The legendary artifact card that jumps to mind for me is of course Excalibur, which will circumvent that pesky high mana value, but there are a ton of sweet options you could put in the deck outside of Equipment
These ones have an interesting mechanic, Impending
Grazilaxx, Illithid Scholar The best home I can think of for Grazilaxx, Illithid Scholar is a ninja deck, where you often want the option of bouncing your own creatures, and youre running a few value ETB creatures anyway
See also: Binder layout planner Is XY - Furious Fists worth collecting as a master set? XY - Furious Fists has 113 unique cards with an estimated completion cost of $1,194
Raise the Past Raise the Past strikes an powerful medium of cost and valuable 2-drops, of which white is king