MetalGreymon (BT21-061) - World Convergence

[[Digivolve] Lv.4 w/[Greymon] in name or w/[ADVENTURE] trait: Cost 3]
[On Play] [When Digivolving] To 1 of your opponent's Digimon, [De-Digivolve 1] for every 2 of your Tamers' colors.
[Your Turn] [Once Per Turn] When your other Digimon are played or digivolve, if any of them have the [ADVENTURE] trait, 1 of your Digimon gains [Alliance] for the turn. Then, 1 of your Digimon may attack.

[Alliance] (When this Digimon attacks, by suspending 1 of your other Digimon, this Digimon gains [Security A. +1] and the suspended Digimon's DP for the attack.)