Undying vs
Keep the package lean, prioritize land tutors, and let opponents sweat a second win axis
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This list isn't gospel, you shouldn't run all of these cards in all of your decks, but you should be looking at them to take up those slots in the 99 that aren't just Wrath of God, Damnation, or any other yawn-inducing card that is generically good, but might not actually be the right fit for you.
You might be expecting another Elsa, but surprisingly the two Iconic cards include a Pocahontas dressed for the cold weather and a Moana who doesn't seem to have got the memo
Frankly, I've never ultimate-d him, because I'd always rather kill something or draw cards and drain life from various effects, but it's nice to know that you have a big effect that could win the game in one hit