Every suggested card is verified against the real card database and format legality before it reaches you.
Build the best decks from cards you already own
In MTG Arena: Options → Account → enable Detailed Logs (Plugin Support), restart Arena, wait ~10 seconds on the home screen, then close it.
Click below and pick Arena's Player.log — it's read locally in your browser (the log is never uploaded; card names are looked up via Scryfall).
Windows: %USERPROFILE%\AppData\LocalLow\Wizards Of The Coast\MTGA\Player.log
Mac: ~/Library/Logs/Wizards Of The Coast/MTGA/Player.log (in the file picker press Cmd+Shift+G and paste the path)
Your collection appears below — pick a format and hit Build My Decks.
Prefer a script? Download the Python exporter (python3 mtga-collection-export.py, standard library only) and paste the resulting collection.txt instead.
Your Collection
Preferences (optional)
You'll get 3-5 decks built only from cards you own (basic lands are always free). Every list is verified against your collection and format legality, and formatted for one-click Arena import.
Past runs are saved in this browser only — nothing is stored on the server.