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Mikaeus, the Unhallowed When it comes to mono-black combo engines, Mikaeus, the Unhallowed is a powerhouse

Featuring six different leaders in OP-04, and their alternate arts which are a bit harder to pull, these tend to be some of the most expensive cards in the set

Just as the two of them now use you

Fast-forward to January 2026, and that same box is commanding prices north of $2,600

The historical significance of certain sets or individual cards also boosts their value

Promo Info booster GREAT LEGEND [BT-04] CLOSECLOSE BT4-018 U Digimon Lv.6 Spinomon Color Red Form Mega Attribute Virus Type Dinosaur DP 10000 Cost 10 Digivolve Cost 1 2 from Lv.5 Digivolve Cost 2 - Upper Text [Your Turn] This Digimon gets +3000 DP