Gammamon - BT21-010 (Reprint) (BT21-010 U) [Advanced Booster Digimon Generation]

Product Details

[[Digivolve] [Gurimon]/Lv.2 w/[Hero] trait: Cost 0]
[Your Turn] While you have 2 or fewer security cards or 3 or more [Hero] trait Tamers with different names, this Digimon may digivolve into [Siriusmon] in the hand for a digivolution cost of 4, ignoring digivolution requirements.

Disclaimer: This card was reprinted from the original set as foil, while the original print was only available as non-foil).