Cursed Totem shuts off Basking Broodscale's Adapt activation, so the Spawn engine it feeds is turned off. Sowing Mycospawn's kicker trigger is unaffected since that's cast-triggered, but Totem also stops Haywire Mite's sacrifice ability and keeps their Eldrazi Spawn tokens from being sacrificed for mana. It does the same to your own Spawn tokens, so keep that in mind when sequencing. Dismember gets trimmed since their best bodies are out of its reach: Devourer of Destiny (6/6) and Sire of Seven Deaths (7/7) are too big for -5/-5, and Emrakul, the Promised End has protection from instants, so Dismember can't target it at all. Keep Trinisphere in the sideboard as a Karn, the Great Creator target rather than boarding it in. This is a grindy mirror-ish matchup where card advantage from Kozilek's Command and your own Eldrazi matter most.

This combo deck relies on Basking Broodscale's Adapt activated ability to put counters on it and trigger Spawn creation. Cursed Totem stops activated abilities of creatures, so it shuts off Adapt entirely, which makes it a strong answer to their plan. Note that Totem does not stop Blade of the Bloodchief's equip, since that is an ability of the Equipment, an artifact, not of a creature. Dismember's -5/-5 is well-positioned to kill Basking Broodscale outright before it grows, so keep all copies in and instead trim Glaring Fleshraker, whose small body contributes little against a combo deck that just needs to resolve its pieces. Prioritize disrupting Blade of the Bloodchief and Basking Broodscale on sight since the loop is nearly unbeatable once it starts.

Izzet Prowess wants to go wide with cheap burn and prowess triggers, so Ensnaring Bridge is strong when you keep your hand small, since creatures with power greater than the number of cards in your hand can't attack. Their creatures (Dragon's Rage Channeler, Monastery Swiftspear, Slickshot Show-Off) are low power individually, and every pump from prowess or Cori-Steel Cutter only makes them less able to attack past the Bridge. Tormod's Crypt gives you a way to exile their graveyard and turn off Dragon's Rage Channeler's delirium. Dismember is a worse card here since Lightning Bolt and burn can race you and paying life for its Phyrexian mana (up to 4 life each time) adds up against an aggressive deck. Vexing Bauble stays in, since it counters spells cast with no mana spent, such as Mishra's Bauble, a Mutagenic Growth paid for with life, and a flashed-back Lava Dart. Chalice of the Void at one stays in to blank Lightning Bolt, Monastery Swiftspear, and Preordain. Trinisphere also punishes their low curve heavily if you want to lean further into the plan, but the swaps above keep Kozilek's Command and Devourer of Destiny in to handle Dragon's Rage Channeler and Slickshot Show-Off.