Spellweave called the Jace precon Stompy
I imported Reality Fracture's Jace precon and Spellweave called it Stompy. See the Polymorph trick it learned the next day and what else got better.
On prerelease day I imported Reality Fracture's Jace precon, Multiverse Reforged, and asked Spellweave what the deck was trying to do.
It said Stompy.
It is not. Wizards built the deck around Polymorph: make disposable tokens, then turn them into the expensive creatures hiding in your library. Spellweave learned Polymorph the next day.
Most of this issue happened the same way: a real deck shows me a gap, and the fix goes live as soon as it is ready and passes the automated tests. No patch days. Since the last issue, I shipped 19 releases, never more than six days apart: 17 new features, 26 improvements and 62 fixes.
If you are new here (and a lot of you are), Spellweave builds Commander decks from the cards you own, or tunes and explains the deck you already play.
The precon, decoded
A sample game. Turn 3, cast for two 1/1 flying Spirits. Turn 4, flash it back for two more. Four 1/1 fliers don't look like much, which is the point. Turn 6, cast . It exiles every creature you control, here just the four Spirits, then reveals cards from the top of your library until it finds four creature cards. All four hit the battlefield. Say they are , , and . That 6-mana Mass Polymorph turned four 1/1s into flying creatures with a combined mana value of 32.
Why it works. Every creature card in the precon costs six mana or more, and the cheap bodies are tokens you are happy to lose. So the reveal can only find something huge. does the same at instant speed, with the creatures arriving at the next end step. Jace's own −3 swaps one creature or planeswalker at a time, and can turn up either.
The legends are the fun part. The deck's Echoverse versions include a mono-white , a mono-black , a colorless and a with no green in her at all. Hit any of them off a polymorph and someone at the table is going to ask to read the card.
What changed in Spellweave. Import the precon and it reads as Polymorph, with Stompy as the backup plan. If you imported it earlier, import it again to pick up the new strategy. Build around from your own cards and you get Polymorph or superfriends, depending on what you own. Across the set, Heartwood token makers count as ramp, and AI Analysis explains Prepared, empower Jace and Heartwood tokens when your deck runs them.
What the analysis says about playing it. Every AI Analysis first plays 1,000 goldfish games with your exact list to check its mana. Two lines from the one I ran on the precon:
Mulligan Guide, Send Back: 0-2 land hands without ramp (in the simulations nearly half of kept two-land hands missed a land drop by turn 4)
Key Synergies: Sacrifice Ginger, Queen of Sweets for 6 life on your turn, then pay 6 life using Niv-Mizzet, Ghost Counsel to draw 6 cards and refill your hand while staying ahead on resources.
Ask Spellweave what your deck is trying to do
What got better for your deck
- Import. Paste a list, or drop in a public Moxfield, Archidekt or MTGGoldfish link. Arena exports work in whatever language your client uses.
- Tune. Aim Deck Tune at the strategy you want, or swap in any card from All Legal Cards, owned or not, by role and price. The new set is already there.
- Analysis. AI Analysis tells you what to keep, how to sequence, and what can beat it. It now checks what it says about your commander against the commander's own card text.
Fixed, too: ManaBox exports arriving as a one-card deck, and Archidekt picking the wrong commander. The rest is on the Releases page.
Two more ways in
Scan your collection with Gestic. Gestic is an independent collection manager with a card scanner, and the first app connected to Spellweave. You link it once. Before you approve, Spellweave lists what Gestic is asking for: your email and display name, creating binders and adding cards to them, and reading your decks. You can revoke it any time from your Account page, under Connected Apps. Each push from Gestic arrives as a new binder, so nothing you already have is overwritten, and you can bring the decks you build here back into Gestic.
Standard, quietly. Standard launched on 11 September without an email, which is a very solo-founder way to ship. You can build a 60-card deck from your binder, with missing cards marked To Acquire, or import an MTG Arena export or an MTGGoldfish link. It is still experimental. Free accounts get 5 Standard builds a day, and if you build a lot, Planeswalker makes them unlimited.
Try it on your own deck
An AI Analysis gives you a mulligan guide, a game plan and the weak spots of a deck you play. It costs 2 mana. If you have never bought mana, your first pack comes with at least 50% extra, so the $5 pack is 8 mana: four analyses. The bonus lasts two weeks from the first time you open the store.
Mana or Planeswalker? Buy mana if you want a few decks looked at. If you analyze or tune a lot, Planeswalker is $11.99 a month, or $99 a year, and includes 20 AI Analyses plus 30 Rare and 10 Mythic builds or tunes every month. If you only want one deck looked at, don't subscribe.
Analyze a deck you already play
When it gets your deck wrong
Spellweave got the Jace precon wrong, and the fix took a day because a real deck showed me the gap. When it gets yours wrong, tell me where on the Feature Requests board or in Discord.
Pauper Commander is next. If you play it, tell me how you build it.
Thanks for reading, and for every bug report that turned into a fix.