An
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card that requieres
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to make
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sounds quite weird...
As it's a trio card, I would put the cost just in 2|1.
In a rainbow, it may be usefull in:
. charging an ice lance
. gain quanta for permafrost in a rainbow
. charge quanta for squid's skill.
. Gain some quanta to make the inundation don't die.
Didn't say "to play puffer fish" or things like that because I assume a balanced rainbow has enough quanta to play the creatures. Also, trident + BH seems less viable because it consumes gravity.
In conclution, I don't think it would have many uses.