July 26, 2018 1:03 p.m.
Neotrup, thanks for your answer. I marked it as an accepted answer, but I actually have another question for you. Homeward Path's activated ability says nothing about creatures on the battlefield. It just says "Each player gains control of all creatures he or she owns." So I guess I'm still curious about my initial question since I still own the card exiled by Seal Away.
July 26, 2018 2:01 p.m.
In order to control a creature you own, it must be on the battlefield (otherwise it's a "creature card, not a "creature").
In the case of Seal Away, you still control the creature. It's just been exiled.
July 26, 2018 4:22 p.m.
Thank you for the clarification, Kogarashi. Now I understand the difference between a creature card and a creature. I appreciate you taking the time.
July 26, 2018 4:39 p.m.