49 cards where the rarity is equal to common and the color identity ≤ R and the card types include “beast” and it’s legal in Pauper Commander

Arcbound Hybrid (Darksteel #97)
Avarax (Dominaria Remastered #112)
Barbarian Outcast (Torment #92)
Batterhorn (Return to Ravnica #87)
Battering Craghorn (Archenemy #30)
Bloodstoke Howler (Legions #89)
Bonethorn Valesk (Scourge #82)
Chainflinger (Odyssey #181)
Charging Slateback (Onslaught #194)
Chartooth Cougar (Masters 25 #125)
Coalhauler Swine (Ravnica: City of Guilds #119)
Colos Yearling (Urza's Destiny #79)
Crested Craghorn (Legions #91)
Desert Cerodon (Amonkhet #128)
Ember Beast (Dominaria Remastered #117)
Ferrovore (Scars of Mirrodin #88)
Flowstone Crusher (Nemesis #81)
Flowstone Shambler (Ninth Edition #185)
Furnace Scamp (New Phyrexia #84)
Furnace Strider (Phyrexia: All Will Be One #133)
Gargadon (Commander Masters #226)
Gilded Cerodon (Hour of Devastation #94)
Goretusk Firebeast (Judgment #91)
Karplusan Wolverine (Coldsnap #87)
Kiln Fiend (Jumpstart #338)
Laccolith Grunt (Nemesis #87)
Laccolith Whelp (Nemesis #91)
Leopard-Spotted Jiao (Global Series Jiang Yanggu & Mu Yanling #23)
Longhorn Firebeast (Torment #103)
Macetail Hystrodon (Dominaria Remastered #130)
Makindi Sliderunner (Battle for Zendikar #148)
Marauding Maulhorn (Magic 2014 #145)
Petravark (Torment #109)
Phyrexian War Beast (Alliances #127a)
Raging Kronch (War of the Spark #141)
Ridgeline Rager (Eighth Edition #215)
Ridge Rannet (Shards of Alara #111)
Ridgetop Raptor (Dominaria Remastered #134)
Rock Badger (Tenth Edition #226)
Sawblade Scamp (Phyrexia: All Will Be One #147)
Shaleskin Plower (Legions #110)
Shrapnel Slinger (Phyrexia: All Will Be One #148)
Soldevi Steam Beast (Alliances #133a)
Spur Grappler (Prophecy #104)
Spurred Wolverine (Onslaught #237)
Stonework Packbeast (Zendikar Rising #255)
Tenement Crasher (Return to Ravnica #108)
Warbeast of Gorgoroth (The Lord of the Rings: Tales of Middle-earth #152)
Wild Colos (Urza's Destiny #100)

This search is finished. Now the real work can begin.