Khans limited was a fairly slow format and while the banners ramped you as opposed to the fixing the monuments provide, it comes as a lower cost and exchanges for a threat at all times whereas the banners didn't always translate to gas
To get an interested buyer when you sell your bulk cards at a flea market, garage sale, or on Facebook Marketplace could take more time, but chances are you and another person can work out a better deal for both of you in contrast to the lower offers at a local LGS or trading card website
As for individually powerful lands, cards like Otawara, Soaring City, Field of the Dead, and Strip Mine are just a few examples of lands worth tutoring for
If you do, draw a card for each artifact you control
With a creature capable of 10,000 fire-power, theres plenty of room to experiment with adding abilities like lifelink or trample to really maximize the value of each swing