Wort, Boggart Auntie and Goblins with Echo
If a triggered ability has a target, you have to choose the target when it goes on the stack.  The target has to be valid both when the ability triggers, and when it resolves.  From the rulebook:


  114.1d A triggered ability is targeted if it identifies something it will affect by using the phrase “target [something],” where the
  “something” is a phrase that describes an object, player, or zone. The
  target(s) are chosen as the ability is put on the stack; see rule
  603.3d.


You get to choose the order in which the triggers go on the stack.  But in this case, that won't help you.  Wort's trigger always happens before Marshall's trigger resolves.  So when Wort's trigger goes on the stack, the Marshall is not yet in the graveyard.  So it is not a valid target for Wort's ability.