In a game earlier today I used Overlord as a Ratcatcher and then another Overlord as a Wine Merchant. The Overlord does appear to go to the reserve mat, but cannot be called back.
As a Ratcatcher, the Overlord went to my reserve mat, but on subsequent turns there is no option to call him back.
As a Wine Merchant, the Overlord went to my reserve mat, but was not called back when I underpaid for a card.
Just FYI
As a Ratcatcher, the Overlord went to my reserve mat, but on subsequent turns there is no option to call him back.
As a Wine Merchant, the Overlord went to my reserve mat, but was not called back when I underpaid for a card.
Just FYI