Problem with simple card shuffle program

from random import random_ui64, seed
from time import monotonic

fn draw(suits: List[String], faces: List[String], numbereds: List[Int]) raises -> String:
    seed(int(monotonic()))

    var rand_suit_idx = int(random_ui64(0, len(suits)))
    var rand_suit = suits[rand_suit_idx]

    # decide whether to use a face card or a numbered card
    if random_ui64(0, 2) == 0:
        var rand_face_idx = int(random_ui64(0, len(faces)))
        return faces[rand_face_idx] + " of " + rand_suit
    else:
        var rand_numbered_idx = int(random_ui64(0, len(numbereds)))
        return str(numbereds[rand_numbered_idx]) + " of " + rand_suit

fn main() raises -> None:
    var suits = List[String]("Clubs", "Spades", "Hearts", "Diamonds")
    var faces = List[String]("Jack", "Queen", "King", "Ace")
    var numbered = List[Int](2, 3, 4, 5,6 , 7, 8, 9, 10)

    print(draw(suits, faces, numbered))