When a card says "target Loot" or "target Monster", it means any valid card of that type in play. If it says "target stashed Monster" or "target opponent Loot", then it is more specific.
From the
Glossary section of the rules:
Stash- Move a card to its owner's stash. That card is stashed face-down unless a rule or ability specifies otherwise (for example, a Monster that survives a fight is stashed face-up). See II.A.12 – STASH.
- When a card is stashed face down, move any tokens on that card to the stockpile, and move all Curses stuck to that card to their owner’s discard pile.
- A zone in the game area that may contain any number of cards that are either in play (face-up) or out of play (face-down).
Target- Some abilities require the controller to choose one or more targets. A target is the Hero(es) or card(s) that particular ability will affect. If there is no available target, a card that requires a target may not be played. If there is no available target, an ability that requires a target may not be activated.