Spend two mana and tap the card to gain a Treasure token - but only if you can best a literal coin flip first
Once on the battlefield, it refills your hand with cards equal to half your artifact count, trading life for resources
Maybe some additional copy effects
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
Smothering Tithe is an enchantment card that many despise as it forces your opponent to pay two mana whenever they draw a card for the rest of the game, but if they refuse to, you get to create a Treasure Token
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