Corruption
Corruption makes Skills cost 0 and Exhausts each Skill when played, according to the listed card text.
How it works
The retrieved card list gives the same effect for the base and upgraded versions: Skills cost 0, and whenever a Skill is played, it is Exhausted. Corruption is labeled a Rare Ironclad Power. The passage does not state any differing upgraded effect or provide broader rules for Skills or Exhaust.
Read the supporting references
A focused reference to ten Ironclad cards and their recorded effects, including listed upgrades and play conditions. Card details come only from the retrieved Slay the Spire 1 card-list passage. This does not attempt a complete card, relic, character-unlock, or Ascension guide. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.