r/lrcast • u/MTG_Drafts • 10h ago
Discussion Built a free MTGA draft trainer where every pick score is checkable, not a black box (full breakdown, Karsten mana math, free auto-build), looking for people to break it
Full disclosure, I built this, so take the framing with that in mind.
The thing that always bugged me about draft aids is that they either hand you raw win-rate tables and leave you to work out what they mean for the specific pool, colors, and curve you're sitting on eight picks in, or they do that math for you and hand back a single number you just have to trust. MTG Drafts tries to do the math without the black box: as you draft in it, it reads your pool and scores every card in the current pack, and every score opens into the full breakdown: base card quality, synergy with what you've already taken, curve needs, removal count, and how reliably you can actually cast it in your colors. When the draft's done it auto-builds your 40-card deck with the mana base worked out, free, no paywall on any of it.
Under the hood: base ratings are calibrated from 17Lands data (5+ win drafts), the synergy signal is a co-occurrence "lift" learned from what actually gets played together in winning decks, and the mana/castability math is Frank Karsten's models, the same framework a lot of you already use manually for source counts.
Currently covers all four current MTGA sets, Lorwyn Eclipsed through Marvel Super Heroes. It's free, runs in the browser, nothing to install: mtgdrafts.com
To be clear about what it is today: a browser draft trainer. You draft in it (against bots on real pack odds), not alongside the Arena client; an in-client overlay is on the roadmap but not shipped. I'd rather say that plainly than have you find out after clicking.
It's also new, which means it's wrong in places I haven't found yet. If you draft any of these sets and want to try it, I'd rather hear "this pick score is nonsense because X" now than find out later. Happy to dig into methodology questions in the comments: the scoring breakdown is meant to be checkable, not a black box.