Infinite Loops

From Archon Arcana - The KeyForge Wiki

While most repeatable interactions involve playing or using cards, and thus are limited by the Rule of Six, in very rare cases, an infinite loop can happen where two or more card abilities will continue to trigger each other repeatedly. In such cases, the active player simply chooses how many times they want to resolve the loop, adjusts the game state accordingly, and then stops resolving the loop so play can resume as normal.

Official rules v1.8 March 2021