This has GOT to be the most fun deck I've played in recent MTG. Mutate Storm. There is a point at which you've just won with the deck already and your opponent just doesn't know it, which is why I say that it takes 40 clicks to get through the victory screen.
The general idea is to mutate
Vadrok, Apex of Thunder
onto something with
Open the Omenpaths
in the graveyard. That's not hard, as you can use Open to cast Vadrok. Every mutate creature in this deck mutates for 4 mana or less, so it will always repay itself if it mutates onto Vadrok, which will let you recast Open. Then, your bottleneck will be cards.
This deck uses
Dreamtail Heron
as part of the combo to help with that, but if you have a second Vadrok on the mutate stack and
See the Truth
in the graveyard, you can use Vadrok #1 to recur Open, and Vadrok #2 to recur See the Truth and draw three cards. At that point, you've won. The density of mutate cards in the deck makes it almost impossible to fizzle out when you draw three cards per mutate. Then, it's just a matter of sliding an
Insatiable Hemophage
onto the stack and winning within 3 mutations.
If you don't combo off all in one turn, having Vadrok on an Insatiable Hemophage will give you first strike and deathtouch, which is hard to get through without removal. The deck is obviously very weak to removal.
You may think it's difficult to get the mana you need, this being a four-color deck. It's not. The deck is really mostly U/R, with the only white being in Vadrok's hard cast option and the only black in Insatiable Hemophage. You'll almost never cast either. You can use blue and red to mutate Vadrok, and when you cast Insatiable Hemophage, you'll almost always have your Open + Vadrok combo already running, and Open will fix your mana for you. However, there are still lots of dual lands in the deck just in case. This is something of a budget mana base that I made using the cards I already had in Arena. Add more pathways and temples if you have them.
This combo is actually somewhat consistent if you're not up against removal. There's so much card draw in the deck that if you mulligan to one combo piece (min. 5 card hand), you're likely to be able to find the other. I've comboed off as early as turn 3 with Pollywog Symbiote into Vadrok, but that's rare.
This is just a really fun deck to take into the play queue, and most opponents will sit through the combo even if they know they've lost just because it's so fun to watch.
Here's a video of gameplay done by a friend of mine, if anyone is interested in seeing the deck in action without crafting it:
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