One of those brutal openings if everything lines up just right. You only need to play this combo once; activating it twice will probably decide the game. It’s so strong, in fact, that absent any must-buy $3’s or $4’s, you should probably open Talisman/Watchtower just to maximize your chances of getting this to work. Bide your time until you draw $4 with the Talisman and Watchtower in hand, then buy a Treasure Map, gain a copy, and place both on your deck.
This also works well with Royal Seal in place of the Watchtower, but on average, that happens quite a bit later in the game.
The best case scenario, as juff activates it on Turn 3 to overcome an otherwise disadvantageous start.