Seven Seas Private, Styx (G-CHB03/055EN) [Rummy Labyrinth Under the Moonlight]

[AUTO]: Forerunner [AUTO](RC): [Put this unit into your soul] When your other unit with "Seven Seas" in its card name is placed on (RC) 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 one grade 1 or greater card with "Seven Seas" in its card name from your drop zone, call it to (RC), and at the end of that turn, retire that unit.