Greymon [EX1-004] (Alternate Art) [Classic Collection] BT5-001 if you have a Tamer

if you have a Tamer in play

Set: Battle of Omni Promos Card type: Digi-Egg Rarity: Uncommon Digi type: Lesser Form: In-Training [When Attacking][Once Per Turn] If this Digimon has [Omnimon] or [Greymon] (other than [DoruGreymon]

and are Mega form

you may play 1 [Impmon] from your trash without paying its memory cost

Greymon [EX1-004] (Alternate Art) [Classic Collection] BT5-001 if you have a TamerSet: Classic Collection Card type: Digimon Rarity: Uncommon Digi type: Dinosaur Play Cost: 5 Form: Champion Attribute: Vaccine Digivolve Cost: 2 Digivolve Cost Level: 3 [When Attacking][Once Per Turn] You may play 1 [Tai Kamiya] with a play cost of 3 or less from your hand without paying its memory cost.