commander · Zimone, Infinite Analyst
Quandrix Unlimited (SOC).
A Simic X-spells deck led by Zimone, Infinite Analyst, stack +1/+1 counters on Zimone to discount X spells, then cast enormous Hydras and Fractals at mana values opponents can't keep pace with.
The Commanders
Quandrix Unlimited is a Simic Commander deck built around X spells and exponential mana scaling. Zimone grows by picking up counters and turns those counters into a discount: your first X spell each turn costs one less mana for each +1/+1 counter on her. With enough counters, you're casting 10-mana X spells for effectively nothing and making armies of Fractals and Hydras that opponents can't match.
Zimone, Infinite Analyst costs {1}{G}{U} and is a 0/4 Human Wizard. The first spell you cast with {X} in its mana cost each turn costs {1} less to cast for each +1/+1 counter on Zimone. Whenever you cast your first X spell each turn, put two +1/+1 counters on Zimone. She feeds herself: each X spell makes her bigger, which makes the next X spell cheaper, which lets you pay more X. By turn seven or eight, Zimone commonly has eight or more counters, which cuts a Hydra's cost by eight and effectively doubles the value of every mana spent.
Key Cards
Hydroid Krasis
The deck's best standalone X spell. Hydroid Krasis costs {X}{G}{U} and enters with X/2X power/toughness (flying, trample), gaining you half X life and drawing half X cards on cast. Those triggers happen on cast, not on resolution, so it can't be countered to deny the value. With Zimone at 8 counters and 12 mana available, Krasis costs effectively 4 mana for a 12/12 flier with trample while drawing 6 cards and gaining 6 life. The cast trigger means opponents can't counter it to deny you the card draw. Hydroid Krasis is the cleanest expression of what Zimone enables.
Echoing Equation
The deck's most explosive X spell. Echoing Equation costs {3}{U} and makes each creature you control into a copy of target creature you control until end of turn. Cast it after building a large Zimone (say, 12 counters) and turn your entire board into copies of Zimone, each with 12 counters. Every copy now generates {12} toward X spells. Then cast any X spell for free with the combined counter reduction. Echoing Equation into a large X spell is the closest thing the deck has to a one-turn kill button.
Finale of Devastation
The deck's direct win condition. Finale of Devastation searches your library or graveyard for a creature with mana value X or less and puts it into play. If X is 10 or more, all your creatures get +X/+X and haste. With Zimone at 8 counters and 12 mana, you cast it for effectively {X=4+8=12}: get any creature from your library or graveyard and immediately win with a +12/+12 buff to your entire board. One swing ends the game.
Rishkar, Peema Renegade
Mana acceleration through Zimone's counters. Rishkar enters and puts a +1/+1 counter on up to two target creatures. Every creature with a +1/+1 counter on it can tap for {G}. In a deck full of creatures that accumulate counters through X spell casting, Rishkar turns your board into a mana-generating engine. Zimone with 8 counters taps for {G} thanks to Rishkar. Multiple counter-laden creatures together produce enough mana to cast enormous X spells the turn after Rishkar enters, massively accelerating the clock.
Zimone and Dinli
The deck's secondary X-spell payoff and counter synergy piece. Zimone and Dinli is a Legendary Creature that creates an X/X Fractal token when you cast your first X spell each turn, in addition to Zimone's normal counter growth. Every Fractal enters with +1/+1 counters equal to X, which means more Rishkar mana, more Echoing Equation copies, and more Finale of Devastation damage. The two Zimone versions working together turn the X-spell reward cycle into an engine that feeds itself.
How to Play
The first three turns are ramp-only. Hit four mana by turn three, play Zimone on turn three or four, and cast your first cheap X spell immediately to put counters on her. Spend each subsequent turn casting exactly one X spell before doing anything else to maximize Zimone's counter accumulation. By turn six, Zimone should have six or more counters, and at that point X spells are dramatically discounted. The win condition is Finale of Devastation with X at 10 or more, which ends the game on the spot with a full board swing. If opponents interact with Zimone repeatedly, switch to Echoing Equation value with whatever large creatures you've accumulated.