"Luck! I know you're in there!" Asta yelled over the roar of the mana. "You love to fight, right? Then fight this! Fight for your seat at the dinner table! Fight for the Black Bulls!"
The sound of their battle was a deafening rhythm of thunder and steel. Every time Asta’s anti-magic sword touched Rufel’s lightning, the sparks hissed and died, but the Elf was too fast. Rufel was mocking them, dancing through their attacks with a grace Luck never had. Black Clover (TV) Episode 105
But it wasn't Luck. Not really. The manic grin was there, but the eyes were cold, glowing with an ancient, vengeful power. The Elf spirit Rufel had taken over, and the lightning crackling around him was no longer the playful spark of a teammate. It was lethal. Then fight this
Luck’s eyes fluttered open. He looked at Asta, then at Magna, then at the destruction around them. A small, genuine smile tugged at his lips. genuine smile tugged at his lips.