Cast less than 3 spells objective

nerdstrap

in 2 different matches, I cast 1 spell, and the objectives immediately showed 2 spells cast. The battle log only logged 1 spell cast. 

Kinesia

Grin. I can guess _1_ possibility.

The sphinx that gets disabled when you cast a spell on him had some interesting behaviour for me a few months back, I can't remember the spell but it was something like:
"Do 2 damage, if there are 8 or more red gems do 4 damage"

The sphinx got disabled and _then_ took the damage anyway, it seems the "if" part was treated as a new spell instead of part of the same one.

Do you know what spell you cast?