Cardology Birth Card (命運撲克牌)

The playing-card birthday system: 55 − (2·month + day) on the Hearts-to-Spades deck, the lineage's own worked examples reproduced, the single-birthday cards and Joker uniqueness proven as theorems, fixed and semi-fixed card facts served — with the spread layer deferred until the 1893 primary source settles the quadration.

Cost: 2 TIAN Points per call. tRPC procedure cardology.birthCard.