Kaycee's mod dupe glitch - please help

[speak22]

I have encountered a bug in Kaycee's mod which involves the magpies eye sigil and the shapeshifter card which causes cards I only have one of the duplicate to an infinite number of copies. This bug seems to happen due to the game messing up with the shapeshifter code and constantly changing his form whenever the sigil is used. I have two instances of this, one of them was in the Leshy boss fight, in which Leshy decided to play a mantis (not a mantis god) I have videos of it but am not sure how to post them here. Has anyone else experienced this bug? (note that after the battle the deck is changed back to how it should be)

[speak22]

Also note that I am playing on a mac book but I used to use an hp until it broke

[Nazemec]

You might want to check this video, it lists the possible uses of Ijiraq, inlcuding the one you mention:
https://www.youtube.com/watch?v=KM3dfnLwXc8

[speak22]

Thank you so much, but that still doesn't explain why Leshy played a mantis