The simplest answer to this question is that cards that are not only desired but also rare enough to warrant a higher price from lack of supply are worth the most
The ONLY difference is the numbering and Latin text (m, kg) which are definitely different enough
It comes with a considerable cost, however, requiring five mana in total to cast, but this hasn't stopped it from becoming a popular card in Commander, which is why it's holding decent value since the launch of Takir: Dragonstorm
Since July 8th, prices have risen from just over $2 to $7.53
(Place the top card of your deck on top of your security stack.) Promo Info BOOSTER SECRET CRISIS [BT-17] CLOSECLOSE P-140 P Digimon Lv.5 MegaKabuterimon Color Green Blue Form Ultimate Attribute Data Type Insectoid DP 8000 Cost 8 Digivolve Cost 1 4 from Lv.4 Digivolve Cost 2 4 from Lv.4 Upper Text [Digivolve] Lv.4 w/[Insectoid] trait: Cost 3 Evade [All Turns] While this Digimon is suspended, it isn't affected by the effects of your opponent's Digimon
Today, however, it appears stalled, and even with new sets on the horizon its future is uncertain