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To answer this question, we first need to discuss the elephant in the room: FlickerFlicker effects

Its cheap, flexible, and works against planeswalkers, artifacts, or even defense counters on battles

Though she has a cost of 7 Ink, Clarabelle is a Floodborn character, which means that she has the Shift keyword, allowing her to be played directly on top of another Clarabelle card, for a reduced cost (in a manner reminiscent of how evolving works in Pokemon)

If an effect copies an instant spell multiple times, Kalamax's last ability triggers that many times

There is no mana cost at which this effect would be playable as-written