Missing sideboard cards? The full 15-card sideboard runs about $51.59.
Buy sideboard on ManapoolPhyrexian Dreadnought dies to Pyroclasm's 2 damage since it has no toughness-boosting shell, and the extra copies help reset the board if they recur it. Cursed Totem shuts off Mishra's Factory's activated pump and Grim Lavamancer-style tricks are irrelevant here, but more importantly it stops them from reusing Stifle-protected triggered abilities if they add creature-based engines post-board. Wild Mongrel is weak against a deck full of free counters and no removal for it to dodge, so it comes out along with the situational Naturalize. Keep Armageddon and Wasteland in, since denying them land drops after a Dreadnought lands buys crucial time, and Swords to Plowshares remains the best single answer to the 12/12.
Aura of Silence is excellent against Azorius Replenish, taxing Opalescence, Parallax Wave, and Decree of Silence before they resolve, then later destroying a landed combo piece outright. Cataclysm is a powerful alternate sweeper since it forces them to pick one land, one enchantment, one creature, and one artifact, almost always costing them their Opalescence/Parallax Wave lock pieces if cast after they've overextended on enchantments. Call of the Herd is too slow against a deck that can lock the board with Parallax Wave, and Naturalize has no good single target when Aura of Silence and Cataclysm cover that role better. Keep Armageddon to cut off Ancient Tomb-fueled fast starts, and Swords to Plowshares handles any Exalted Angel or Meddling Mage they bring in.
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