at the beginning of your end step, if a land entered the battlefield under your control this turn and you control a prime number of lands, create primo, the indivisible, a legendary 0/0 green and blue fractal creature token, then put that many +1/+1 counters on it. (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31 are prime numbers.)