The Collective at his peak withallthe powers of the mutants depowered on M-day vs Composite Superman with all of the powers of the Legion of Super Heroes
hmm. what if Mon-El and Ultra Boy were taken out and he just had Superman like powers from Super girl and * The ability to grow to giant size (Colossal Boy)
* The ability to shrink (Shrinking Violet)
* The ability to divide into 3 people (Triplicate Girl)
* The ability to fire lightning bolts (Lightning Lad)
* The ability to generate heat and light (Sun Boy)
* The ability to make things super-lightweight (Light Lass)
* The ability to make things super-heavy (Star Boy)
* The ability to eat any form of matter (Matter-Eater Lad)
* The ability to turn invisible (Invisible Kid)
* The ability to inflate into a large ball (Bouncing Boy)
* The ability to stretch any part of his body (Elastic Lad)
* The ability to shapeshift (Chameleon Boy)
* Telepathy (Saturn Girl)
* 12th level intelligence (Brainiac 5)
* Magnetic powers (Cosmic Boy)
* X-ray vision that could see through anything, even lead (Ultra Boy)
* The ability to transmute elements (Element Lad)
* The ability to phase through solid matter (Phantom Girl)
* The ability to reduce the heat around himself or other objects (Polar Boy)
* master of every form of martial arts to have been developed up to the 30th century (Karate Kid)
* possesses the superhuman ability to generate illusions (Sensor Girl)
* Reality warping scream (Tyroc)
* The ability to cause accidents and disasters (Calamity King)
* develop the powers appropriate to defeat any one opponent (Nemesis Kid)
* The ability to wield a light-cancelling Darkforce (Umbra)
* Spell casting for a variety of effects (White Witch )
* Able to absorb various sorts of energy attacks (Blok)
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There's just plain no way Collective can win this. After all, Composite Superman has the ability of "Flying Disguise"!