Jessica goes to pee before they even start their assignment, after just introducing Lexi to her mom and dad as "one of Chief Swan's kids", and Lexi doesn't want to do work by herself or she wouldn't have come over in the first place. She sits on the couch and plunks her bag down and waits. There's a random deck of cards over there; she picks it up and flips through it. She's been trying to learn to bridge-shuffle.
Lexi blinks. She looks around for an electronic device of some sort that could've said that.
"Eep!" exclaims Lexi in a soft voice. It probably won't even carry to Jessica's parents, who are out in the back garden, let alone Jessica herself in the hall bathroom.
"You're a deck of cards," objects Lexi. "You're talking, and you're a deck of cards."
"I am a magical artifact," says the deck of cards. The cards tuck themselves back into the pack, and the whole thing scoots toward her.
"Bella will just flip," predicts Lexi, and she scoops up the cards into her hand.
"The activation password is: Of my own heart and will, I choose to command you."
"Yeah! She'll know what to do with it," says Lexi. "She'll flip, like I said, I think maybe she should have you."
"To speak with you takes power," it says. "If you accept me, we will have more power."
"...Wait, didn't you say limitless, how does more limitless even be an option?"
"Right, I think Bella would be a good master for limitless power, if I had it instead she'd want to tell me what to do all the time."