If one of my opponent's Digimon has this card's effect used on it and it digivolves and now has 1 or more digivolution cards, how does this card's effect resolve?

This card can only be used to target cards that meet its requirements upon activation. So the effect would still apply, and even though the target Digimon has gained digivolution cards, it still can't attack or block.

Sorrow Blue rulings (ST2-14)

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

Effect: [Main] Choose 1 of your opponent's Digimon with no digivolution cards. That Digimon can't attack or block until the end of your opponent's next turn.
Security effect: [Security] Choose 1 of your opponent's Digimon with no digivolution cards. That Digimon can't attack or block until the end of your next turn.

Official Q&A

If one of my opponent's Digimon has this card's effect used on it and is suspended, can I attack that Digimon?
Yes, you can.
Ruled Mar 28, 2024
If one of my opponent's Digimon has this card's effect used on it and it digivolves and now has 1 or more digivolution cards, how does this card's effect resolve?
This card can only be used to target cards that meet its requirements upon activation. So the effect would still apply, and even though the target Digimon has gained digivolution cards, it still can't attack or block.
Ruled Mar 28, 2024

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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.

Sorrow Blue rulings (ST2-14)

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

Effect: [Main] Choose 1 of your opponent's Digimon with no digivolution cards. That Digimon can't attack or block until the end of your opponent's next turn.
Security effect: [Security] Choose 1 of your opponent's Digimon with no digivolution cards. That Digimon can't attack or block until the end of your next turn.

Official Q&A

If one of my opponent's Digimon has this card's effect used on it and is suspended, can I attack that Digimon?
Yes, you can.
Ruled Mar 28, 2024
If one of my opponent's Digimon has this card's effect used on it and it digivolves and now has 1 or more digivolution cards, how does this card's effect resolve?
This card can only be used to target cards that meet its requirements upon activation. So the effect would still apply, and even though the target Digimon has gained digivolution cards, it still can't attack or block.
Ruled Mar 28, 2024

Got a line that uses Sorrow Blue? Map it in the builder and share it with a link.