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.)
Zimone rewards hitting land drops: each turn you put a land into play and reach a prime number of lands, you create Primo, a Fractal that grows to match your land count. You ramp aggressively with extra land drops and recursion, fueling a massive Primo while drawing cards and developing a value-oriented Simic board, then close with an enormous trampling/unblockable threat.
Cheap 3-mana commander that immediately generates a scaling board threat
Naturally synergizes with the strongest GU staples: ramp, card draw, extra land drops
Primo scales to lethal sizes very quickly and remaps to your highest land count
Blue gives access to protection, counterspells, and card advantage to defend the plan
Reliant on a single token (Primo) that's vulnerable to removal and board wipes
Counting prime lands can be disrupted by land destruction or tax effects on landfall
Lacks innate evasion—Primo needs trample or unblockable enablers to connect
Wants extra land drops and consistent landfall, which can be inconsistent without setup
Legendary Creature — Human Wizard
