Burn is so direct and pure that a seemingly small difference is anything but, especially on the cheaper cards

Abolisher of Bloodlines Abundant Maw All Is Dust Anticausal Vestige Artisan of Kozilek Aurora of Emrakul Azlask, the Swelling Scourge Bane of Bala Ged Blight Herder Breaker of Armies Breaker of Creation Brisela, Voice of Nightmares Chittering Host Conduit of Emrakul Conduit of Ruin Deathless Behemoth Deceiver of Form Decimator of the Provinces Desolation Twin Devourer of Destiny Distended Mindbender Dronepack Kindred Drownyard Behemoth Drownyard Lurker Echoes of Eternity Elder Deep-Fiend Eldrazi Conscription Eldrazi Devastator Eldrazi Linebreaker Eldrazi Mimic Eldrazi Ravager Eldritch Immunity Emrakul, the Aeons Torn Emrakul, the Promised End Emrakul, the World Anew Endbringer Endless One Erupting Dreadwolf Eternal Scourge Extricator of Flesh Fibrous Entangler Final Iteration Flayer of Loyalties Glaring Fleshraker Grisly Anglerfish Hand of Emrakul Hanweir, the Writhing Township Herigast, Erupting Nullkite Howling Chorus Idol of False Gods Inversion Behemoth It That Betrays It That Heralds the End It That Rides as One It of the Horrid Swarm Kozilek's Channeler Kozilek's Command Kozilek's Pathfinder Kozilek, Butcher of Truth Kozilek, the Broken Reality Kozilek, the Great Distortion Lashweed Lurker Matter Reshaper Mockery of Nature Not of This World Nulldrifter Oblivion Sower Pathrazer of Ulamog Reality Smasher Ruin Processor Sinuous Predator Sire of Seven Deaths

And the nature of Commander forces players to pack their decks with card draw, so Nekusar has no trouble dishing out huge amounts of damage
Shinobi cant fully whiff like Ink-Eyes, and it generates a lot of value but without evasion or the ability to protect itself, value alone cant break this into Constructed playability