Place it at the end of a highlight, after the winning move has already been shown, so the line acts as the payoff. Open the sequence with Okay Let's Go to set up the attempt, then follow the boast with Inception Horn for a bigger finish.
Über diesen Sound
Morgana delivers the line 'It's almost scary how good I am' in a smug, self-satisfied voice, stretching the boast just enough to make it land as a joke. It feels playful and cocky, like a victory lap after a clever move, and it works best when the confidence is clearly tongue-in-cheek rather than serious.