Binding of Isaac: Rebirth Wiki

Guppy's Collar is a passive item.


  • Grants a permanent 50% chance to resurrect on death.
    • Resurrection leaves Isaac at half of a Red Heart Red Heart, or half a Soul Heart Soul Heart if he had no Red Heart Containers.
  • This item belongs to the Guppy set. Collecting three items from this set will transform Isaac into Guppy.


  • Resurrection items activate in a set order. Guppy's Collar is Removed in Repentance 4th / Added in Repentance 6th in this order after Added in RepentanceSoul of Lazarus Soul of Lazarus, 1up! 1up!, Removed in RepentanceDead Cat Dead Cat, Removed in Repentance Lazarus Lazarus' inherent extra life (Added in Repentance swap the order of the previous two), and Added in RepentanceInner Child Inner Child.
  • It is possible to obtain two collars by finding one in a Red Chest Red Chest, without picking it up, and then finding another collar in a different Red Chest. Removed in Repentance However, this does not have any additional effects and does not count towards transforming into Guppy.
    • Added in Repentance Obtaining multiple copies of Guppy's Collar now grants extra lives, depending on how many copies are obtained (obtaining a second collar displays the lives count as '2?', and so on). The chance for Guppy's Collar to activate is defined with separate rolls, but increases the odds for one of the collars to revive Isaac. Additional collars also count towards the Guppy transformation.
  • Resurrecting in a Curse Room Curse Room may trap Isaac if he has no way of recovering health or exiting them without losing health.
  • Added in Afterbirth † Resurrecting via Guppy's Collar during a Daily Challenge will count as a death, even if the run is eventually completed.

In-game Footage[]




PC RWBY 10FQ (Curse Room Curse Room adjacent to spawn, in Red Chest)

PC 1CMD B881 (Curse Room Curse Room adjacent to spawn, surrounded by Spiders)

PC Added in Afterbirth FM7Z 4VAJ (Curse Room Curse Room adjacent to spawn, surrounded by Spiders)

PS4 FQTL 13FX (Curse Room Curse Room adjacent to spawn)

Switch XSDE HE2L (First floor Curse Room Curse Room)


Bug Bug! Removed in Afterbirth † When the Keeper Keeper is resurrected by Guppy's Collar, there is a chance he spawns with a Half Soul Heart instead of Coin Hearts. When an HP up is obtained, Keeper will have 1 Coin Heart, as well as the Half Soul Heart he had previously. When a second HP up is obtained, Keeper will lose the Half Soul Heart and have 2 Coin Hearts, like normal.
Bug Bug! Removed in Afterbirth † Guppy's Collar can be exploited to gain infinite lives. When Isaac's last will is on the screen, close the game, re-open it, and continue the run. Isaac will appear to die again, and will also have a separate chance to be resurrected.