An example of this interaction not working correctly would involve a new evoke elemental, for example Deceit, being in the graveyard. When casting Kavaero copying Deceit with 2 blue and 2 black spent once it enters as the elemental, the elementals "When this creature enters the battlefield if 2 of x mana was spent to cast do this" does not trigger. This interaction works in paper as rather than a cast trigger the elemental has an enter the battlefield trigger which should indicate that it works with Kavaero, which it currently does not in arena.

Please fix this as this boils down to him becoming a 4 mana cmc 4/4.