Rulings
Q1: Does this card's digivolution requirement where it can digivolve from a Tamer mean that the Tamer that will become a digivolution card is treated as a Digimon when it digivolves?
No, it digivolves from the Tamer as-is.
Q2: When a Tamer would digivolve using this card's digivolution requirement, is it considered a Digimon that would digivolve?
No, it isn't considered a Digimon that would digivolve. When a Tamer would digivolve using this card's digivolution requirement, "when a Digimon would digivolve" effects don't trigger.
Q3: When a Tamer digivolves using this card's digivolution requirement, is it considered a Digimon that digivolves?
No, it isn't considered a Digimon that digivolves. When a Tamer digivolves using this card's digivolution requirement, "when a Digimon digivolves" effects don't trigger.
Q4: My opponent has 1 red and blue Digimon and 1 red and yellow Tamer. How many cards do I trash from the tops of both players' decks when this card's On Play When Digivolving effect activates?
3 cards. In this case, there are 3 colors (red, blue, and yellow) in your opponent's Digimon and Tamers, therefore you trash 3 cards from the tops of both players' decks.
Data Sources
Lv.4 Velgrmon BT18-079 R Hybrid | Variable | Giant Bird [Digivolve] [Koichi Kimura]: Cost 3/[Duskmon]: Cost 1 [On Play] [When Digivolving] For each color your opponent's Digimon and Tamers have, trash 1 card from the tops of both players' decks. Then, for each card this effect trashed, this Digimon gets +1000 DP for the turn. [End of Attack] By deleting 1 level 4 or lower purple Digimon, delete all of your opponent's Digimon with the lowest level. --- Inherited: <Retaliation> (When only this Digimon is deleted in battle, delete the Digimon it battled.)
Lv.4 Velgrmon BT18-079 R Hybrid | Variable | Giant Bird [Digivolve] [Koichi Kimura]: Cost 3/[Duskmon]: Cost 1 [On Play] [When Digivolving] For each color your opponent's Digimon and Tamers have, trash 1 card from the tops of both players' decks. Then, for each card this effect trashed, this Digimon gets +1000 DP for the turn. [End of Attack] By deleting 1 level 4 or lower purple Digimon, delete all of your opponent's Digimon with the lowest level. --- Inherited: <Retaliation> (When only this Digimon is deleted in battle, delete the Digimon it battled.)
Lv.4 Velgrmon BT18-079 R
Hybrid | Variable | Giant Bird
[Digivolve] [Koichi Kimura]: Cost 3/[Duskmon]: Cost 1
[On Play] [When Digivolving] For each color among your opponent's Digimon and Tamers, trash the top card of both players' decks. Then, this Digimon gets +1000 DP for each card trashed by this effect for the turn.
[End of Attack] By deleting 1 level 4 or lower {{Colour|purple}} Digimon, delete all of your opponent's Digimon with the lowest level.
---
Inherited: <Retaliation>.Lv.4 ベルグモン BT18-079 R ハイブリッド体 | ヴァリアブル種 | 巨鳥型 「木村輝一」:コスト3/「ダスクモン」: コスト1 【登場時】【進化時】相手のデジモン/テイマーの色1色ごとに、お互いのデッキを上から1枚破棄する。その後、この効果で破棄した1枚ごとに、ターン終了まで、このデジモンをDP+1000。 【アタック終了時】紫のLv.4以下のデジモン1体を消滅させることで、最もLv.の低い相手のデジモン全てを消滅させる。 --- Inherited: ≪道連れ≫（バトルでこのデジモンだけが消滅したとき、バトルした相手のデジモンを消滅させる）