"Any Number"

From Archon Arcana - The KeyForge Wiki

When a game rule or card ability states that a certain action involves “any number,” that number includes zero.

Likewise, if a card ability states a certain action involves doing something “up to” a specified number of times, the active player may resolve the ability using any number in the specified range, including zero.

KeyForge Master Rulebook v17.3 March 2024