'Shallow's Grave', Storm-Scow

Islandwalk, Swampwalk.
Crew 4
'Shallow's Grave', Storm-Scow cannot be crewed
unless Em, Daughter of Storms is in the crew.
While crewed, 'Shallow's Grave', Storm-Scow has
the abilities of the crewing creatures. Pirates you
control get +1/+1. If you would create a number
of 'Treasure' tokens, create one more.