This isnt a subtle weapon, and even the latest strategies involving it revolve around setting it up as a surprise bonk
Once on the battlefield, it refills your hand with cards equal to half your artifact count, trading life for resources
My list doesn't focus on cEDH at all, but I can imagine this has a home there, given the sheer amount of stack interaction in that format
As always I'm going to recommend doubling extra turns
Dark Depths (Counters Legendary Land) An infamously powerful land, [c]Dark Depths[/c] aims to remove all ten of the ice counters it enters with
Gimmicky planeswalkers are ones that have a twist to them, only having negative abilities, maybe being an uncommon walker, a nonlegendary one, one centered around only zeroes, one that transforms, one that has a plus that can get it to an ult directly by adding loyalty counters, etc