Collection import
Clicking a precon adds its legend, whole main deck, runes and battlefields to your collection (with confirmation) and the precon gets tracked — its copies are then locked in your collection.
Paste lines like “2x Card Name [OGN-123]” (foil copies with a “(foil)” suffix), or a semicolon CSV with an id;normal;foil header. Then add to your collection, or replace it entirely.