This first pass isnt meant to be an exhaustive catalogue of every problematic card in Magic s history, and we will continue to take actions on similar cards in the future.
Between the life drain and the mill aspect of Radiation, the mechanic is incredibly strong if you can build up a stack of rad counters on your opponent

Angrath, Captain of Chaos Averna, the Chaos Bloom Burning Cinder Fury of Crimson Chaos Fire Carnage, Crimson Chaos Caves of Chaos Adventurer Chaos Balor Chaos Channeler Chaos Charm Chaos Confetti Chaos Defiler Chaos Dragon Chaos Harlequin Chaos Imps Chaos Is My Plaything Chaos Lord Chaos Maw Chaos Moon Chaos Mutation Chaos Orb Chaos Shrine's Black Crystal Chaos Spewer Chaos Terminator Lord Chaos Wand Chaos Warp Chaos, the Endless Chaoslace Chaosphere Coronation of Chaos Curse of Chaos Defender of Chaos Domri, Chaos Bringer Game of Chaos Gauntlets of Chaos Grip of Chaos Hidetsugu, Devouring Chaos In the Eye of Chaos Jan Jansen, Chaos Crafter Lady Loki, Agent of Chaos Mikey & Leo, Chaos & Order Okaun, Eye of Chaos Order // Chaos Order // Chaos Planar Chaos Plargg, Dean of Chaos Rakdos, Patron of Chaos Reign of Chaos Sower of Chaos Throes of Chaos Zurzoth, Chaos Rider
Back to the game at hand
This is not because it is wrong to play them but because I play so much cube I get fed up pissing around shuffling all day long, plus they make the deck look uglier along with Ram-Gang and Figure