I might be too generalize about my Ubastet + Fleshripper plan without doing any calculation. I guess I could try to do it now!
Ubastat is not available in All seeing Eye, but assuming other Delve level 500 have similar stats, I have to borrow your screenshot above.
Assuming other missing troop also have around 50 attack stats. Here is the extra damage for Ubastet’s boost in first cast.
[(280×4)+(50×4)]/6 = 220 extra damage per troops.
Now for Fleshripper’s extra damage boost, casting on Xerodar.
553-(557/3) = 367 life points left.
Nope! It’s still 140 damage away, which I assume Fleshripper/Ubastet base damage from bonus stats from Hoards Level 100 still won’t help close the gap that much.
But still, if you can find other troops to bring a single troop’s life points below 220, Ubastet could kill it and insta-kill other healthy 1K stats troop in the process. As both Hero and Ubastet are able get some mana start-up despite using the same color, it could work!