Chaos Warp isnt something we need in a post-Generous Gift/Solitude world, while Return to Dust has been, well, returned to dust
Eshki grows fast and becomes a serious threat on its own, and the deck quickly builds overwhelming board presence through efficient ramp, creature cost reduction (like Goreclaw, Terror of Qal Sisma), and dragon-specific synergy cards such as Dragon's Fire, Fearsome Whelp, and Dragonhawk, Fate's Tempest
Then, demons being able to deal damage to any target is when they enter might be even stronger
Just like Falling Star, Chaos Orb was ultimately banned due to dexterity reasons
Legendary Creature - Human Assassin Roshan, Hidden Magister Other creatures you control are Assassins in addition to their other types
Because of that, its going to end up in the bulk bins