2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Can I activate this card's <Your Turn> effect when I attack with a 2-color green/blue (in that specific order) Digimon or with a Digimon that is blue and green because of an effect?
Yes, you can.
Ruled Mar 28, 2024
Can I also activate this card's <Your Turn> effect when my 3-color Digimon with blue and green attacks?
No, you can't. Since this card's effect specifies "one of your 2-color blue and green Digimon", you can't activate this card's <Your Turn> effect if your Digimon has 3 or more colors, even if those colors include blue and green.
Ruled Mar 28, 2024
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