

Q1: My opponent has 2 Digimon. If I use De-Digivolve in this card's On Play When Digivolving effect to de-digivolve 1 of my opponent's Digimon into a Digi-Egg card without DP, is the "if your opponent has 2 or more Digimon" condition in this effect still met?
Yes, it is. In this case, even if De-Digivolve de-digivolves an opponent's Digimon into a Digi-Egg card without DP, it won't be trashed until this card's On Play When Digivolving effect is resolved, so that card is still treated as a Digimon. Therefore, this effect's "if your opponent has 2 or more Digimon" condition is still met, and you can return 1 of your opponent's level 4 or lower Digimon to the hand. After returning it, the Digi-Egg card is trashed. In addition, if a Digi-Egg card is returned to the hand by this effect, that card is placed at the bottom of the Digi-Egg deck.
Q2: My opponent has 2 Digimon. If I use De-Digivolve in this card's On Play When Digivolving effect to de-digivolve 1 of my opponent's Digimon into a Tamer, is the "if your opponent has 2 or more Digimon" condition in this effect still met?
No, it isn't met. In this case, if De-Digivolve is used to de-digivolve an opponent's Digimon into a Tamer, the "if your opponent has 2 or more Digimon" condition in this effect is no longer met.
Q3: What cards can be played from under my Tamers using this card's On Deletion effect?
It can play 1 Blue Flare trait Digimon card with a play cost of 5 or less, or it can play 1 Xros Heart trait Digimon card with a play cost of 5 or less.
Lv.6 ZeigGreymon BT19-026 R Mega | Virus | Cyborg/Blue Flare [On Play] [When Digivolving] <De-Digivolve 2> 1 of your opponent's Digimon. Then, if your opponent has 2 or more Digimon, return 1 of their level 4 or lower Digimon to the hand. [On Deletion] You may play 1 [Blue Flare] or [Xros Heart] trait Digimon card with a play cost of 5 or less from under your Tamers without paying the cost. Then, <Save>. --- [All Turns] This Digimon gets +2000 DP.
Lv.6 ZeigGreymon BT19-026 R Mega | Virus | Cyborg/Blue Flare [On Play] [When Digivolving] <De-Digivolve 2> 1 of your opponent's Digimon. Then, if your opponent has 2 or more Digimon, return 1 of their level 4 or lower Digimon to the hand. [On Deletion] You may play 1 [Blue Flare] or [Xros Heart] trait Digimon card with a play cost of 5 or less from under your Tamers without paying the cost. Then, <Save>. --- [All Turns] This Digimon gets +2000 DP.
Lv.6 ZeigGreymon BT19-026 R mega | Virus | Cyborg/Blue Flare [On Play] [When Digivolving] <De-Digivolve 2> 1 of your opponent's Digimon. Then, if your opponent has 2 or more Digimon, return 1 of your opponent's level 4 or lower Digimon to the hand. [On Deletion] You may play 1 [Blue Flare] or [Xros Heart] trait trait Digimon card with a play cost of 5 or less from under your Tamers without paying the cost. Then, <Save>. --- [All Turns] This Digimon gets +2000 DP.
Lv.6 ジークグレイモン BT19-026 R 究極体 | ウィルス種 | サイボーグ型/ブルーフレア 【登場時】【進化時】相手のデジモン1体を≪退化2≫。その後、相手のデジモンが2体以上なら、Lv.4以下の相手のデジモン1体を手札に戻す。 【消滅時】自分のテイマーの下から、特徴に「ブルーフレア」/「クロスハート」を持つ登場コスト5以下のデジモンカード1枚をコストを支払わずに登場できる。その後、≪セーブ≫。 --- 【お互いのターン】このデジモンをDP+2000。