Seven Seas Private, Styx

:Forerunner :[Put this unit into your soul] When your other unit with "Seven Seas" in its card name is placed on from drop zone, if you have a grade 3 or greater vanguard with "Seven Seas" in its card name, you may pay the cost. If you do, choose a grade 1 or greater card with "Seven Seas" in its card name from your drop zone, call it to , and at the end of that turn, retire that unit.