First Edition
| Card Name | Blank Canvas |
| Type | Monster Deck |
| Card Text |  ?
|  ?
|  ?As this enters play, reveal cards from the top of the monster deck until you reveal 3 non-event monster cards. This has the  ,  , and  of the first, gainsthe abilities of the second, and has the rewards of the third. Put the revealed cards outside the game. When this leaves play, put them into discard.  ?  |
| Category | Basic Enemies |
| Game Mode(s) | All Game Modes |
| Set | The Unboxing of Isaac  /  |
| Released | 2023 |
| Language(s) | English |
| Background Artist | Yazawa Akio |
| Card Artist | Orisghost |
Blank Canvas (2) and Blank Canvas (1) were included as the first printed challenge cards of Four Souls in the exclusive 13th Unboxing of Isaac subscription box. This box was given for free to both annual and monthly subscribers, as long as no boxes were skipped.
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