30 cards where the text includes “madness” and the color identity ≤ GRU and (the card is available on Paper) and it’s legal in Commander

Abandon Reason (Eldritch Moon #115)
Alchemist's Greeting (Commander 2019 #133)
Anje's Ravager (Crimson Vow Commander #141)
Arrogant Wurm (Torment #120)
Avacyn's Judgment (Crimson Vow Commander #142)
Basking Rootwalla (Mystery Booster 2 #65)
Blazing Rootwalla (Mystery Booster 2 #54)
Bloodboil Sorcerer (Commander Legends: Battle for Baldur's Gate #164)
Bloodmad Vampire (Shadows over Innistrad #146)
Broken Concentration (Shadows over Innistrad #50)
Chilling Grasp (Eldritch Moon #50)
Circular Logic (Dominaria Remastered #42)
Distemper of the Blood (Eldritch Moon #126)
Emrakul, the World Anew (Modern Horizons 3 #6)
Falkenrath Gorger (Crimson Vow Commander #146)
Fiery Temper (Commander 2019 #142)
Incorrigible Youths (Shadows over Innistrad #166)
Insatiable Gorgers (Eldritch Moon #134)
Just the Wind (Ultimate Masters #60)
Malevolent Whispers (Commander 2019 #150)
Nagging Thoughts (Shadows over Innistrad #74)
Obsessive Search (Dominaria Remastered #61)
Reckless Wurm (Time Spiral Remastered #181)
Revolutionist (Modern Horizons 2 #139)
Senseless Rage (Shadows over Innistrad #180)
Skophos Reaver (Modern Horizons 2 #140)
Stensia Masquerade (Crimson Vow Commander #150)
Stromkirk Occultist (Crimson Vow Commander #151)
Violent Eruption (Commander 2019 #154)
Welcome to the Fold (Shadows over Innistrad #96)

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