Rulings
Q1: Which cards can be played by this card's Main effect?
A Digimon card with the text "DRACOMON" or a Digimon card with the text "EXAMON".
Q2: Does this card's All Turns effect trigger when any card leaves?
A Digimon card with the text "DRACOMON" or a Digimon card with the text "EXAMON".
Q3: What do you mean by "cards with text?"
It refers to cards with the specified word or icon included in "name, trait, effect, inherited effect, <Overflow X>, jogress, digivolution requirements, burst digivolution". For example, a card with the text "Knightmon" refers to a card whose name is "Dark Knightmon" or whose effect says "Knightmon".
Q4: If two Digimon including the leaving Digimon digivolved by the "Delay" effect of this card, does the Digimon that digivolved DNA digivolves leave the Battle Area?
No, they do not leave the Battle Area. DNA digivolves digivolve as a new Digimon, so it is a different Digimon than the one that leaves.
Data Sources
Unleash the Dragon Gene BT20-093 C [Main] You may play 1 Digimon card with [Dracomon] or [Examon] in its text from your hand with the play cost reduced by 3. Then, place this card in the battle area. [All Turns] When any of your Digimon with [Dracomon] or [Examon] in their texts would leave the battle area other than in battle, <Delay> • 2 of your Digimon may DNA digivolve into [Examon] in the hand. --- [Security] You may play 1 Digimon card with [Dracomon] in its name from your hand or trash without paying the cost. Then, place this card in the battle area.
Unleash the Dragon Gene BT20-093 C [Main] You may play 1 Digimon card with [Dracomon] or [Examon] in its text from your hand with the play cost reduced by 3. Then, place this card in the battle area. [All Turns] When any of your Digimon with [Dracomon] or [Examon] in their texts would leave the battle area other than in battle, <Delay> • 2 of your Digimon may DNA digivolve into [Examon] in the hand. ---
竜因子の解放 BT20-093 C 【メイン】自分の手札から、「ドラコモン」/「エグザモン」の記述があるデジモンカード1枚を支払う登場コスト-3で登場できる。その後、このカードをバトルエリアに置く。 【お互いのターン】「ドラコモン」/「エグザモン」の記述がある自分のデジモンがバトル以外でバトルエリアを離れるとき、≪ディレイ≫。 • 自分のデジモン2体で手札の「エグザモン」にジョグレス進化できる。 --- 【セキュリティ】自分の手札/トラッシュから、名称に「ドラコモン」を含むデジモンカード1枚をコストを支払わずに登場できる。その後、このカードをバトルエリアに置く。