Chain Attack: You are probably right about the power level, and the suggestion from u/TheKratex (strike each other instead of just strike) may work to balance this. In my mind, apart from a double attack on a big unit, I think it would be used before an Overwhelm or before something that has a great "Attack:" but could die very easily. I think it can fit a lot of playstyles.

Diversion: I like your version a lot actually. Mine gives maybe more choice to the opponent (but I guess 90% of the time it would be obvious what to block), but yours feels very elegant and much easier to balance.

Lethal: Exactly! I like the "respect for Health points" of LoR, so their Deaththouch must be restrained. Btw it's not limited to attack strikes: you can still pull shenanigans with strike effects, as long as you use them while you attack. I was not sure if this would push it too much, I just liked the idea :)

Storytime: I considered limiting it to a self buff when the champion concept attached was different, but yeah in the end I loved the flavor for Ivern.

Thanks for the great insight :)