There are 11 multipliers in Lightning Blackjack. They are 2x, 3x, 4x, 5x, 6x, 8x, 10x, 12x, 15x, 20x and 25x. A RNG (random number generator) will give you one with your win. If you won with a Blackjack, then the your multiplier will be guaranteed to be higher than 5x, but it will still be randomly awarded.