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Describe the Bug:
Knight of the Holy Nimbus activated ability seems to be a triggered ability and seems to have wrong time-stamp as it is available after the creature has regenerated so it doesn't stop it from regenerating of course.

Which card did behave improperly?
Knight of the Holy Nimbus

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink dev 778ccb5 version - duel

What exactly should be the correct behavior/interaction?
Knight of the Holy Nimbus activated ability is activated either at all times or at manalink regeneration time but before it regenerates so it stops regeneration.
There is in this topic a suggestion for a better solution for opponent to activate it and solve this bug and that,too by Korath:
viewtopic.php?f=86&t=19129&p=201923&hilit=knight+of+the+holy#p201926

Are any other cards possibly affected by this bug?
Same bug for Clergy of the Holy Nimbus.

I'm noticing slightly different behavior in the current version. Using the same topic because it doesn't look like this was ever fixed.

Describe the Bug:
1. When the AI controls a Knight of the Holy Nimbus, I can kill it with cards like Lightning Bolt without using its ability (first screenshot).
2. When I control a Knight of the Holy Nimbus, the same is not true for the AI. It is unable to kill my knight (second and third screenshots).
3. The AI is also unable to kill my knight even if it activates its ability (fourth, fifth, and sixth screenshots). This has been reported before.

Which card did behave improperly?
Knight of the Holy Nimbus

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
March 2021 - Allegiances and Alliances, duel

What exactly should be the correct behavior/interaction?
Knight of the Holy Nimbus should regenerate unless its controller's opponent activates its ability.

Are any other cards possibly affected by this bug?
Clergy of the Holy Nimbus is probably also affected.

My apologies for the lack of a save file. I'm not sure why the function doesn't work for me. It simply doesn't generate a file.

Fixed all in commit c49c36d. Now it uses an activated ability for opponent through a legacy.