Getting Karn to resolve is an asymmetrical Null Rod, allowing Pox to Cursed Scroll and Phyrexian Totem without restraint. Mycosynth Lattice is just win as Karn starts an infinite LD loop turning artifacted lands into 0/0 creatures. Unfortunately, unless you're on artifact mana acceleration or lucky enough to draw 2 Dark Rituals, it's a gamble play. Pox can stall till it hits the 6th land drop. Ensnaring Bridge in the wishboard makes for easy defense.
I think the other bomb Planeswalker is Liliana, Waker of the dead. She's nearly identical to OG Lili but with a less powerful ultimate. Having her melt a Marit Lage token is one of the best feelings in the world.

Unlike OG Lili, she can actually kill you. The ultimate is far too slow to compete and steal enemy Hogaaks...
