“Simic Rhythm is a tempo-combo deck that uses mana acceleration from Llanowar Elves and Nature's Rhythm to flood the board with creatures ahead of curve, leveraging Gene Pollinator and Badgermole Cub to generate incremental value off each land drop or spell. The deck builds toward overwhelming threats like Craterhoof Behemoth or a wide token army via Spider Manifestation, using Quantum Riddler and Ouroboroid as resilient mid-game engines that grind out value. Multiversal Passage and the blue splash provide interaction and reach, while the sideboard pivots toward counterspell-backed disruption against control and graveyard hate against attrition matchups.”
Missing sideboard cards? The full 15-card sideboard runs about $114.
Buy sideboard on ManapoolBoth Hearth Elemental and Eddymurk Crab get cheaper based on instants and sorceries in the opponent's graveyard, so Soul-Guide Lantern's graveyard exile can meaningfully tax their ability to cheat those threats out early. Extra Spell Pierce punishes their cantrip-heavy, low-curve draws (Opt, Sleight of Hand, Flow State) when they're tight on mana. Terrian, World Tyrant and one Quakestrider Ceratops come out since they're slow, clunky top-end that doesn't interact with a tempo-combo deck trying to go over the top with growing Elementals before we stabilize. Keep Garruk's Uprising and the low curve creatures to pressure them before Sunderflock bounces our board.
UR Aggro wants to race with cheap spells and grow Slickshot Show-Off / Stormchaser's Talent-adjacent threats, but Stormchaser's Talent itself is banned so their curve leans on Temur Battlecrier and Spider Manifestation for the aggressive plan; Defend the Rider's hexproof/indestructible mode protects our key blockers and attackers from their removal (Burst Lightning, Hex Magic-fueled burn). Doubling Spell Pierce punishes their low curve early when they're tapped out for a two-drop. Lumbering Worldwagon is too slow against a tempo deck that wants to close fast, and Rogue's Passage doesn't matter when we're racing rather than being stonewalled. Keep the core engine intact since Garruk's Uprising and Frenzied Baloth are exactly the resilient, hasty threats that punish their lack of sweepers.
Dimir Midrange leans on The Wondrous Wasp, Enduring Curiosity, and Requiting Hex-style removal to grind through our threats, so Defend the Rider keeps our best creature alive through their removal package and lets us push damage. Soul-Guide Lantern disrupts Enduring Curiosity's return-from-graveyard value and denies any incidental graveyard synergy while giving us a way to draw a card later. Spell Pierce underperforms since this deck curves out with efficient creatures and has plenty of mana to pay around it by the time key spells resolve, so it and the top-heavy Terrian, World Tyrant plus a Lumbering Worldwagon step out for more resilient threats.