This is the old bug which is effected when terror/lyco occurs from various troops, and EoE.
So it’s not been fixed properly. It’s part of this, reported on 18th December (not for the first time btw).
What happens is once you summon, presumably the Harpy is a summon, the side effect is that various things go wrong. The catalyst for this to occur would have been an EoE cast earlier in the game.
What’s broken still;
One - is the collection of mana, like in your video.
Two - you will whiff with skulls, which cost me a game, skull whiff on EoE with no dodge, barrier, no entangle on me and no ability of opponent take attack.
Three - your hero will not collect mana if you summon
Four - during GW one of our players Javelin of Suncrest was changed from green to blue mana…
Five if you test your teams vs EoE, so battle a guildee with a team set involving EoE. If they change you to a Toad, or Lycantrophy works, when you repeat your battle the line up will actually be what you were changed to, not the team you selected.
The terror element of the bug appears to be fixed on the face of it, as troops are fleeing (on turn 0 ofc) but the side effect is not.
Oh and there is another bug with Takshaka getting extra turns from none 4 matches. I had a battle where Taks cast but didn’t get an extra turn as none of my troops got stunned by Elementalist (in the case of hero, it was not entangled or given burning) and they recast… So something to do with wildcards…
If I can summon the will, I will see if can replicate.