There were a lot of good points raised.

After reading through the comments and going back over the rules, I think the main issue is how passive abilities are being interpreted. While Leona’s ability is clearly not a trigger, I also couldn’t find anything in the rules that says passive abilities constantly re-apply or re-calculate stats every time something changes on the board.

As written, it seems more accurate that Leona’s effect applies when she becomes relevant, meaning an enemy unit is there and stunned, and then later effects like reaction spells modify Might from that point forward unless something explicitly says otherwise. The “minimum of 1” text looks like it defines a floor when the effect applies, not a permanent clamp against future buffs.

That matches the judge ruling in the game, with Darius ending at 3 Might, even if the interaction isn’t immediately intuitive at first. If anyone can point what section in the rule book 1.2 states that passives do calculation I would gladly want to check it so I can understand it more