import bpy

card_x = 80
card_y = 10
card_z = 135

card_margin = 10

grid_x = 22
grid_z = 5

backplate_x = (card_x + card_margin) * grid_x + card_margin
backplate_y = 30
backplate_z = (card_z + card_margin) * grid_z + card_margin

def draw_backplate():
    bpy.ops.mesh.primitive_cube_add(location=(0, 0, 0), radius=1)
    bpy.ops.transform.resize(value=(backplate_x, backplate_y, backplate_z))
    return bpy.context.scene.objects.active

def draw_cards():
    bpy.ops.mesh.primitive_cube_add(location=(0, 0, 0), radius=1)
    bpy.ops.transform.resize(value=(card_x, card_y, card_z))
    cards = bpy.context.scene.objects.active

    cards_x_modifier = cards.modifiers.new(name="CardsXArray", type="ARRAY")
    cards_x_modifier.fit_type = "FIXED_COUNT"
    cards_x_modifier.count = grid_x
    cards_x_modifier.use_relative_offset = True
    cards_x_modifier.relative_offset_displace = ((card_x + card_margin) / card_x, 0, 0)

    cards_z_modifier = cards.modifiers.new(name="CardsZArray", type="ARRAY")
    cards_z_modifier.fit_type = "FIXED_COUNT"
    cards_z_modifier.count = grid_z
    cards_z_modifier.use_relative_offset = True
    cards_z_modifier.relative_offset_displace = (0, 0, (card_z + card_margin) / card_z)

    return cards

def main():
    draw_backplate()
    draw_cards()

main()