Furnace
When can the starting card's upgrade ability be used, and what does each upgrade cost?
The rulebook prices each upgrade, and several players confirm the timing.
- Furnace rulebook · Rulebook · Start-up cards and Upgrading
- tool · Community · 2021-05-13
- DoomTurtle · Community · 2021-09-17
- odditie · Community · 2025-05-23
Only when the starting card is run in the production phase, and only at that step, as many times as its text allows. Each card you upgrade costs one coal and one upgrade token. A card upgraded before it runs uses its upgraded side that round; a card already run waits until the next round.