First Edition
| Card Name | Teratoma |
| Type | Monster Deck |
| Card Text |  5
|  3+
|  1Each time this takes damage, put a spider counter on it. When this dies, the active player deals × damage divided as they choose to any number of players, where × is the number of spider counters on this.  +1 Treasure  |
| Category | Bosses |
| Game Mode(s) | All Game Modes |
| Set | The Unboxing of Isaac  |
| Released | 2023 |
| Language(s) | English |
| Background Artist | Yazawa Akio |
| Card Artist | PCAP |
Teratoma, along with Eggy and Evis, was exclusive to The Unboxing of Isaac subscription service for February 2023 (Hush Box).
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