A quick request: Supressing Fire reads "This champion makes a free attack against any enemy units moving into its range. This ability triggers once per turn.", however it has a weird interaction with stealth whereupon the ability triggers and no attack is made, this seems somewhat counter-intuitive so could it either NOT trigger when a stealthed champion passes through the area or trigger and actually do damage as the champion passes through?
Making fury basic attacks only kinda misses the underlying issues to me. First, fury says it should only proc when an opposing champ is attacked but is bugged to proc off both opposing and friendly. This would already help the issue a lot. Second, I think auras being an attack has got to be one of the most confusing things in Pox. Imagine being new to the game, reading the text of Final Word, and thinking to yourself "Hm ok, well if I position my aura champ here, I can kill that way, and avoid procin last word! Whoaaaaaaaa what the ..." What would we lose if auras just weren't counted as attacks?
Fury states that it gives the bonus due to damaging foes, not attacking foes. The friendly interaction is a bug. I agree with your assessment of auras, they shouldn't be attacks, and thus could bypass final word. I really think fury should just proc once per damage source. Aura hits 3 enemies, +1 dmg. Bomb hits 4 enemies, +1 dmg. Attack once and damage an enemy with an aura, +2 dmg.
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Its quite simple backlash damaging the opponents shrine for marsh song would be a good idea, unless of course you play FS then that would be a terrible idea.
Honestly, that would almost certainly just make those spells unplayable. If that is the goal, then they should just redesign the spells to do something else entirely.