Agumon

[Start of Your Main Phase] If you have a Tamer with [Tai Kamiya] in its name, this Digimon may digivolve into [Greymon] in your hand without paying the cost.

[Your Turn] While this Digimon has [Greymon] or [Omnimon] in its name, it gets +2000 DP.

[Digivolve] [Koromon]: Cost 0