Quote from TheOnlyOne652089 »the new Karn is really crazy in Modern as he does simply everything.
Wish for graveyard removal, check, wish for Wurmcoil Engine, wish for Ensnaring Bridge, wish for hexproof Witchbane Orb, wish for Chalice of the Void, Engineered Explosives, all crazy on their own.
He can also destroy artifact lands, make Aether Vial a creature to destroy it with Path to Exile or Lightning Bolt, just in case they kill Karn (say against humans or spirits) and most importantly, it can destroy 0 mana cost artifacts from the opponent, if they are not completely hated by its Null Rod ability.
You can find an answer to everything, and you can tutor from your sideboard, just too good.
Winning by locking the opponent out of the game with Mycosynth Lattice is pretty much just icing on the cake.
To ensure nobody meddles or counters your stuff, the new 3 mana Teferi fits right in and pulls enormous weights in modern too.
Karn + Teferi, stupidly good, they produce an entirely new control shell together, as there is absolutely nothing they dont hate in modern, they solve literally every problem.