If Seraph isn’t on the battlefield at the time the other creature is put into a graveyard, the ability won’t trigger. However, the ability does trigger if Seraph and the other creature are put into the graveyard at the same time.
Seraph
If the other creature ceases to be a creature card after it leaves the battlefield (it’s an animated Mishra’s Factory, for example), it will be returned to the battlefield by this ability and you will have to sacrifice it when you lose control of Seraph.
If the other creature is a token, it will cease to exist after being exiled. It won’t be returned to the battlefield.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Christopher Rush
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
