Rulings
Q1: What does an "is also treated as a Digimon with X000 DP" effect do, exactly?
It causes that card to also be treated as a Digimon with X000 DP. For example, if a Tamer is treated as a Digimon, it will gain inherited effects. In addition, it will be able to attack.
Q2: If a Tamer is treated as a Digimon using an "is also treated as a Digimon with X000 DP" effect, is it no longer considered a Tamer?
No, it is treated as both a Digimon and a Tamer.
Q3: If a Tamer is treated as a Digimon using an "is also treated as a Digimon with X000 DP" effect and it activates an effect, is it treated as an effect of a Digimon or a Tamer?
When it activates an effect, it is considered both a Digimon effect and a Tamer effect.
Q4: Can I gain memory using an effect on a Tamer that's treated as a Digimon with X000 DP due to an effect while my opponent has "your opponent can't gain memory other than by Tamer effects" activated?
Yes, you can. When an effect is activated on a card that's treated as both a Digimon and a Tamer, the effect is treated as both a Digimon effect and a Tamer effect, therefore you can gain memory.
Q5: If this card's On Play When Digivolving effect is used to treat Marcus Damon as a Digimon, can I use the part of the effect after "then" to attack using that Marcus Damon?
Yes, it can attack.
Q6: If this card's On Play When Digivolving effect is used to treat Marcus Damon as a Digimon, can I choose to not attack using the part of the effect after "then"?
Yes, you can.
Q7: Does this card's All Turns effect also trigger when a Marcus Damon treated as a Digimon is deleted?
Yes, it triggers.
Data Sources
Lv.5 RizeGreymon BT21-044 U Ultimate | Vaccine | Cyborg [Digivolve] [GeoGreymon]: Cost 3 [On Play] [When Digivolving] For the turn, 1 of your [Marcus Damon]s is also treated as a 3000 DP Digimon, can't digivolve, and gains <Rush> and <Alliance>. Then, 1 of your Digimon may attack. [All Turns] [Once Per Turn] When any of your yellow or red Tamers are deleted, you may place 1 [Marcus Damon] from your trash as the top security card. --- Inherited: [All Turns] [Once Per Turn] When any of your yellow or red Tamers are deleted, you may place 1 [Marcus Damon] from your trash as the top security card.
Lv.5 RizeGreymon BT21-044 U Ultimate | Vaccine | Cyborg [Digivolve] [GeoGreymon]: Cost 3 [On Play] [When Digivolving] For the turn, 1 of your [Marcus Damon]s is also treated as a 3000 DP Digimon, can't digivolve, and gains <Rush> and <Alliance>. Then, 1 of your Digimon may attack. [All Turns] [Once Per Turn] When any of your yellow or red Tamers are deleted, you may place 1 [Marcus Damon] from your trash as the top security card. --- Inherited: [All Turns] [Once Per Turn] When any of your yellow or red Tamers are deleted, you may place 1 [Marcus Damon] from your trash as the top security card.
Lv.5 RizeGreymon BT21-044 U
Ultimate | Vaccine | Cyborg
[Digivolve] [GeoGreymon]: Cost 3
[On Play] [When Digivolving] For the turn, 1 of your [Marcus Damon]s is also treated as a 3000 DP Digimon, can't digivolve, and gains <Rush> and <Alliance> Then, 1 of your Digimon may attack.
[All Turns] {{OncePerTurn}} When any of your {{Colour|yellow}} or {{Colour|red}} Tamers are deleted, you may place 1 [Marcus Damon] from your trash as the top security card.
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Inherited: [All Turns] {{OncePerTurn}} When any of your {{Colour|yellow}} or {{Colour|red}} Tamers are deleted, you may place 1 [Marcus Damon] from your trash as the top security card.