Guppy's Collar

Guppy's Collar is a passive item.

Effects

 * Isaac has a permanent 50% chance to resurrect on death.
 * Resurrection leaves Isaac at half a red heart.
 * Guppy's Collar takes priority over all other resurrection items when activated.

Seeds
RWBY 10FQ (Curse room adjacent to spawn, in red chest) 1CMD B881 (Curse room adjacent to spawn, surrounded by spiders) FM7Z 4VAJ (Curse room adjacent to spawn, surrounded by spiders) FQTL 13FX (Curse room adjacent to spawn)

Trivia

 * This item is a tribute to Edmund's cat Guppy.
 * This item may also be a reference to the Schrödinger's Cat thought experiment.
 * It is possible to obtain two collars by finding one in a red chest, without picking it up, and then finding another collar in a different red chest. However, this does not have any additional effects and does not count towards transforming into Guppy.
 * Resurrecting in a Curse Room may trap Isaac if he has no way of recovering health or exiting them without losing health.