Boseiju, Who Endures channels for 1G to blow up Urza's Saga, Eldrazi Temple, or Ugin's Labyrinth before they go off, and swaps in as a land so it costs nothing. High Noon is weak since this is a grindy, non-burn matchup where tempo matters less than disruption. Surgical Extraction can strip a key piece like Basking Broodscale or Devourer of Destiny out of their deck after you see one in hand or graveyard. Archon of Cruelty comes out since Indomitable Creativity and Leyline Binding are better at interacting with their permanents, and you don't want to dilute your hits off Creativity with an expensive card that doesn't answer the board.

Boseiju, Who Endures is premium here, destroying Urza's Saga before chapter III fetches Blade of the Bloodchief, or blowing up Eldrazi Temple/Ugin's Labyrinth to slow their mana. Surgical Extraction can remove Blade of the Bloodchief or Basking Broodscale from their deck entirely once you see a copy, which is devastating against a combo built around two specific pieces. High Noon is weak since the combo kills before the enchantment matters and doesn't care about one-spell-per-turn restrictions when the loop is a repeated ability, not casting spells. Archon of Cruelty comes out for Boseiju since you want cheap, flexible answers over a six-mana body that doesn't interact with their engine pieces.

Consign to Memory costs {U} and counters a colorless spell or a triggered ability, so it can answer Mishra's Bauble spells and shut down the Cori-Steel Cutter Flurry trigger that makes the Monk token. Replicate adds {1} per copy, if you want to hit additional targets. Brotherhood's End sweeps their swarm of 1-2 toughness creatures (Dragon's Rage Channeler, Monastery Swiftspear, Slickshot Show-Off) for 3 damage each. Pawpatch Formation stays in, since Slickshot Show-Off has flying and Dragon's Rage Channeler gains flying with delirium, so its destroy-a-flyer mode has real targets. Prismatic Ending is weak here since their nonland permanents are mostly cheap creatures better answered by a sweeper or Galvanic Discharge.