Ocelot Pride Midrange goes wide fast with Ocelot Pride, Guide of Souls, and Ajani, Nacatl Pariah tokens, so Abrupt Decay is premium uncounterable removal for any of those three-drops-or-less threats before they snowball. Endurance can flash in as a 3/4 blocker to stem the token swarm and its graveyard-hate ETB blunts any Cabal Therapy or Overlord-style recursion they bring. Veil of Summer protects our combo pieces from their Thoughtseize and draws a card whenever they cast it. Duress is weak here since their deck is proactive and creature-heavy rather than reliant on key noncreature spells, and Legolas's Quick Reflexes is too narrow against their wide-board plan.

Dimir Tempo leans heavily on Thoughtseize, Force of Will, and Daze to strip and counter our combo pieces, so Veil of Summer is excellent both to protect a key spell and to draw a card off their hand disruption or removal. Surgical Extraction can strip a copy of Thoughtseize or a key threat like Nethergoyf, especially after they discard or cast it. Karakas bounces a problematic Bilbo, Thief in the Night, resetting their card advantage engine. Not of This World is largely dead here since it does nothing against their countermagic and costs the full seven mana to protect Vampire Hexmage or Dark Depths before Marit Lage is in play, so it comes out for more proactive protection.

Doomsday wants to assemble a five-card stack ending in Thassa's Oracle, so Surgical Extraction is crucial to strip Thassa's Oracle or Lion's Eye Diamond from their hand/graveyard/library once you see a copy, denying their win condition entirely. Veil of Summer protects our hand from Thoughtseize and Force of Will while drawing a card, and gives our combo pieces hexproof from their blue and black interaction. Not of This World only protects creatures with power 7 or more or things targeting our permanents, which is largely irrelevant since Doomsday rarely targets our permanents with removal, and Sylvan Safekeeper's land-sacrifice ability is too slow against a deck racing to combo off before we need protection.