Dice make much better damage counters than the discs of card, and again, in live competition theyre used anyway: 1 = 10 damage, 6 = 60
Competitive prices based off the market
Goblin Engineer is a retro foil reprint, highly useful for artifact-based decks, and worth $9.48
Heck, the Moxen are so broken in concept that versions of them that would come out years later - like Mox Diamond, Chrome Mox, Mox Opal, and Mox Amber - have all proven themselves to be pretty broken as well
Factor that into the additional set-up for a big nope for me, but Im not here to yuck anyones yum
You can obtain the Durant (1-Diamond rarity) card by opening Mega Rising: Mega Altaria, Mega Rising: Mega Blaziken, and Mega Rising: Mega Gyarados from Mega Rising set