If Umezawa's Jitte had cost 1W or Masticore 2RR, they still would have dominated their respective formats, but they at least would have been restricted to decks capable of producing a given color of mana
You have to sacrifice four creatures when you cast it, but it turns every one of you swamps into a Tim (or Prodigal Sorcerer)
Collectors and investors actively seek Machamp cards, particularly rare variants likeMachamp EX, Machamp VMAX, Machamp GX, and vintage holographic versions
Using a something like Diabolic Intent, Grim Tutor, or Demonic Tutor to just pull your meld power out of your deck could put you way ahead of your opponent, provided you have the mana to cast both halves as well
The ability to reduce Character costs and remove threats gave Black a unique disruptive identity that punished greedy decks
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