When a card ability instructs players to swap control of cards, the cards exchange places with one another, and each player gains control of the specified cards from their opponent. If there are not two eligible cards to swap control, the swap does not occur.
When two creatures in different battlelines swap control, they each move to occupy the space of the other in the opposing batteline. Any upgrades, tokens, and counters on the creatures remain on the creatures in their new positions.
—KeyForge Master Rulebook v18.3, February 2026