Normally we see weird stuff pop up in Modern every month or so, but it's just one deck. Maybe two. With Modern Horizons and some assists from Core Set 2020, there've been dozens of wild ideas bouncing off the walls. The last week or two has been a real gold mine for these decks. Here are the ones I think are the most promising.
What the Heck Does It Do?
The other overlapping engine is Arcane draw spells plus Psychic Puppetry. By stapling a Twiddle onto every Peer Through Depths, Ideas Unbound, and Reach Through Mists you cast, you're building a critical mass of free card draw to be able to churn through your deck, find Past in Flames, cast it, and churn the rest of the way into a Grapeshot.
What It Does Well:
Since all the Seething Song and Rite of Flame "Rituals" that make two mana per cast are banned, Storm has always had to jump through hoops to be fast. That usually involves some engine permanent to net extra mana, with Pyromancer Ascension and Goblin Electromancer being the most obvious.
Lotus Field is a unique engine permanent due to being a hexproof land. You can't Thoughtseize or Thought-Knot Seer it. You can't Field of Ruin it. You can't do a lot of things to it you would expect to use to interact.
The other part of Twiddle Storm that is exciting is that it's very good at being the combo deck that goes off exactly one turn before it dies.
If you give Twiddle Storm time, it has a lot of card selection. It can spend turns burning time to make a combo turn almost deterministic. If you don't give it time, it can push on Turn 3 and see where the chips fall.
My first instinct was to add Sylvan Scrying to this deck because it does require a Lotus Field to go off, but after some play the deck is fairly good at just finding the card with cantrips or Tolaria West. If the deck is a bit short in more practice, the solution is almost surely more blue cards and not adding a clunky Expedition Map or green spells.
What It Doesn't Do Well:
Even if Lotus Field isn't something you can hit with discard, Psychic Puppetry is. You really need to find a copy of this card while going off to really go off, because your deck is a bunch of two-mana card draw with only a few Twiddles otherwise.