Cards like Mycosynth Lattice or Trinisphere push Karn from irritating to game-ending, and the fact that this happens without attacking explains why he ranks among good planeswalkers, arguably one of the best to ever get printed for artifact-heavy metas
From there, the decks high proportion of trap cards - including control cards like Skill Drain and Gozen Match, whose primary aim is to prevent your opponent from being able to perform any counter-moves - are used in the deck to ensure Eldlich remains on the field
We have yet to see a character with an exert ability on them be all that good
When everyone saw the heist at the Pok Court, this was big news in the Pokmon community, so much so that customers started sharing information about the kind of cards being targeted
Perhaps he'd also be a good ramp option for Obeka, Brute Chronologist, who could end the turn to skip the land-return drawback