We can all think of Treasure-heavy decks that could get value from Mines of Moria, and of course youd throw this in to artifact sac decks like Jan Jansen, Chaos Crafter
Chocobos make a big splash in MTG as Bird-tribal creatures that thrive on Landfall effects, usually gaining +1/+0 for each land you put out
Counterspells are a little too situational, and it is often just going ot be better to add to your board with three mana than count on your opponent playing something that you will counter
While silver and gold versions exist, we havent seen them appear in auctions, although PSA lists four copies of the gold trophy print graded at PSA 8,9, and 10
You can still collect this payoff incrementally by adding extra value to your flicker effects, or you can aim for a combo strategy that goes infinite and ends the game with your victory when executed correctly
Artifact - Book Color tag templates(None) Umezawa's Jitte Whenever equipped creature deals combat damage, put two charge counters on Umezawa's Jitte