Deck-Building Run Progression

A run opens with a weak starting deck and a branching map. Each fight offers a card as a reward, shops sell more, and relics rewrite rules for the rest of the attempt. Adding cards dilutes the deck, so refusing a reward is a genuine move and card removal is a service worth paying for. Death resets everything except unlocks, which widen future options rather than strengthen the next attempt.

Mega Crit released Slay the Spire into early access in 2017, joining two forms that had matured separately: the tabletop deck-builder, where a deck is constructed during play rather than before it, and the roguelike run with procedural layout and permadeath. Both are built from randomised, self-contained decisions. Merging them swapped the roguelike's item build for a deck, which is legible, tunable and cheap to author.

Imitators arrived by the dozen, and card-based runs became a default structure for small teams because content scales through combination rather than through art. Costs are the familiar ones for randomised design. A run can be lost to a bad offer rather than a bad decision, and the probability reading that experts do fluently is opaque to newcomers. Balance work is effectively endless.