Ah voilà la réponse en fait ^^ :
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6) Spirit Attacks
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There are unique cards that can appear in your deck by chance during battle.
These are cards created by the spirit that inhabits Kalas. There are six
spirit cards, one for each element. There is apparently no 7th spirit card
for the neutral element.
These cards are helpful in a tight squeeze, and their frequency in battle is based on
the spirit´s bond to Kalas. This is affected by the responses that you ( as the
spirit) give Kalas when he or anyone else asks you a question. When they appear,
spirit cards will take the place of another card that is in your current draw
pool ( the cards that you are able to use in that turn).
Here is a list of the six known spirit cards:
Seraph the Shine
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Element: Light
Strength: 70 ( 50)
Demons the Dark
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Element: Dark
Strength: 70 ( 50)
Hellfire
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Element: Fire
Strength: 70 ( 50)
Saint Bubble
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Element: Ice
Strength: 70 ( 50)
Chrono Still
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Element: Chrono
Strength: 70 ( 50)
Distort Wind
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Element: Wind
Strength: 70 ( 50)