39 cards where it’s legal in Commander and the text includes “sacrifice a creature:” and the color identity ≤ R

Altar of Dementia (Modern Horizons #218)
Ashnod's Altar (Commander Masters #368)
Barrage of Expendables (Jumpstart #292)
Blasting Station (Fifth Dawn #107)
Blood Rites (Commander 2013 #101)
Bloodshot Cyclops (Eighth Edition #179)
Bubbling Cauldron (Jumpstart #460)
Carnage Altar (Commander 2013 #238)
Culling Dais (Double Masters #246)
Dark-Dweller Oracle (Double Masters 2022 #106)
Diamond Valley (Masters Edition #175)
Eye of Yawgmoth (Nemesis #129)
Fiery Bombardment (Eventide #52)
Fodder Cannon (Eighth Edition #302)
Goblin Bombardment (Modern Horizons 2 #279)
Helm of Possession (Tempest #291)
High Market (Forgotten Realms Commander #246)
Jinxed Idol (Tempest Remastered #224)
Jinxed Ring (Stronghold #137)
Keldon Necropolis (Vintage Masters #300)
Lazotep Quarry (Modern Horizons 3 Commander #79)
Life Chisel (Masters Edition III #199)
Miren, the Moaning Well (Saviors of Kamigawa #163)
Orcish Bloodpainter (Coldsnap #94)
Phyrexian Altar (Double Masters 2022 #311)
Phyrexian Vault (Duel Decks: Phyrexia vs. the Coalition #21)
Pyre of Heroes (Kaldheim #241)
Ravenous Amulet (Foundations #131)
Relic Vial (Zendikar Rising #250)
Scorched Rusalka (Ravnica Remastered #122)
Shivan Harvest (Invasion #167)
Skirsdag Cultist (Modern Masters 2017 #112)
Skull Catapult (Masters Edition II #219)
Spawning Pit (Duel Decks: Mirrodin Pure vs. New Phyrexia #69)
The Golden Throne (Warhammer 40,000 Commander #157)
Thermopod (Coldsnap #100)
Trading Post (Commander Anthology Volume II #225)
Weaponize the Monsters (Ikoria: Lair of Behemoths #140)
Witch's Oven (Throne of Eldraine #237)

It is the moment of discovery, the triumph of the mind, and the end of these results.