- This card could also refer to cobalt blue, the blue pigment made of cobalt metal, aluminum, and oxygen. This is a transition metal salt and has a crystalline structure.
- "Crystal Beast Cobalt Eagle" is featured in the artwork of the following cards:
- Older Spanish prints of this card use the word "regresar" instead of "devolver", which is the official term for "return" in that TCG branch.
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