GreyKnightsmon (EX4-021) - Alternative Being Booster Foil

[On Play] [De-Digivolve 1] 1 of your opponent's Digimon. Then, all of your opponent's level 4 or lower Digimon can't attack until the end of your opponent's turn.
[All Turns] When this Digimon would be deleted or returned to your hand or deck, you may play 1 [MetalGreymon], and 1 [DarkKnightmonl from this Digimon's digivolution cards without paying the costs.
[DigiXros -2] Blue [MetalGreymon] × [DarkKnightmon]]