The Swap card transposes the player with a random nearby monster (if there are any). If either party was caught in a net at the moment the card was drawn, the other party will become entangled if possible. (Xom thinks entangling oneself this way is hilarious.)
The Swap card could be found in the following decks over the past several versions.
|0.11||0.12||0.13||0.14||0.15||0.16||0.17||0.18||0.19 and beyond|
This card was removed in the deck simplification of 0.19.