Prime Catcher is incredibly powerful because it allows players to swap an opponent's Pokmon from their bench into the Active Spot while also selecting a new attacker
It's strong enough to 2hko stuff, the defense increase is great, and the power is interesting
We already saw how badly Aven Trooper and Chimney Imp finished on this list
Copying a counterspell or pump spell is virtually useless due to the timing on this ability, but imprinting a removal spell or draw spell can level the playing field against your opponents
Its a perfect adaptation of how they work in the Final Fantasy games: they take over the battlefield for a short time, perform a powerful move, and then leave
As a thought exercise, I decided to put trading card games on the spectrum, and they mostly fell on the complex side