My board was set up with creature1-bishop of rebirth, creature2-arvad, creature3-vampire token. I cast costly plunder which destroys creature3, then the bishop just disappeared, then the ‘when a nontoken vampire dies’ part triggers off the bishop and makes another token.
There is a bug in the Elenda fight where if any creature is destroyed the rest on that side lose their buff from opponent creatures dying. If that causes a creature to have 0 toughness, it dies.
This is not noted anywhere in the node rules or in the battle log, which is why I assume it is a bug. It has also been there (and reported several times) since the event was first created, so maybe it isn’t a bug?