On counterfeit cards, blacks are not always black, they can have colored artifacts intermingled amongst the solid areas
(10/7/2022) If a face-down permanent you control leaves the battlefield, or if the game ends or you leave the game while you control it, you must reveal it to all players (even though in this case, everyone saw it before it entered)
With your big creatures, you want to either deal damage consistently or help your game plan
Pyromancers Goggles Pyromancer's Goggles works best with Fireball effects like Crackle with Power and Electrodominance, though its a little too slow and restrictive to make it into your average spellslinger deck
This only increases speculation on how much a Gem Mint 10 could sell for
Fetch lands can grab these, as can cards like Farseek that search up lands of a specific type