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Any two Creatures with Undying will go infinite, like Butcher Ghoul and Hancock, Ghoulish Mayor, as the +1/+1 and -1/-1 counters cancel each other out each time and you sacrifice those two Creatures infinitely as long as you have a way to gain life

Now, you dont quite win the game on the spot, but if youre able to navigate a game into a position where you are able to protect your Karn and resolve Mycosynth Lattice, your opponent will be completely stripped of their ability to cast anything else, thanks to the one-two punch of Lattice turning all opposing lands in artifacts that now cannot be activated thanks to Karn

Halo foils, especially mythics are in short supply, so this has a chance to show big gains

One of the things that has made this so powerful is that the discard is part of the payment, not part of the effect