Comeuppance has always been a good card and apparently the price has been creeping up, so Im glad to see its getting some exposure here
These are the Bonnie Pall, Clearcutter's and Overwhelming Forces of a set
Clarion Conqueror Stax abilities can help you to stop activated abilities of creatures, artifacts, and planeswalkers
It's an easy way to remember that you have an opportunity to outplay and outwit your opponent, if only your creature can outlast combat
The rest of the cycle from Eventide are equally enigmatic, like Overbeing of Myth (those are owls on the shoulders and head of a humanoid with a blindfolded face), Nobilis of War (yes, its a goat chariot), Deity of Scars (your standard minotaur-esque fella) and Dominus of Fealty (a flying Eldar wizard made of clouds)
Given how important oil counters seem in the set, I think we've got a sleeper on our hands here