Tile Color Changers

Here is my list from Countdown Management.

BB _7 -- Cyclops -- 8 -> -- Mutant Revolutionary
BB 12 -- Thor 3 -- add 9 -- Thunder Strike
BB 12 -- Thor4 -- convert 3 enemy tiles -- Striking Distance (level 5)
BB 15 -- Hood -- choose blocks to destroy -- Twin Pistols
CC _9 -- Magneto (C) -- 9 tiles become Protect -- Coercive Field
AA 11 -- Captain America -- choose tile -- Star Spangled Avenger (level 5)
BB 11 -- Magneto (MN) -- destroy 5x5 block -- Magnetic Flux
BB 14 -- Black Widow (GS) -- choose blocks to destroy -- Pistol
CC 11 -- Sentry -- destroy 9 red tiles -- Supernova
CC _9 -- She-Hulk -- destroy 16 tiles -- Power Of Attorney
CC 10 -- Cyclops -- destroy random row -- Optic Blasts
CC _6 -- Ragnarok -- Add 4 -- Thunderclap
DD _8 -- Thor 3 -- Add 3 -- Mjolnir’s Might
AA PA -- Falcon -- remove random enemy tile -- Redwing (level 4)
AA _7 -- Invisible Woman -- lock 4 tiles -- Force Bubbles (level 5)
AA 12 -- Captain America -- choose tile -- Peacemaker (level 5)
BB _9 -- Black Widow (O) -- increase timers -- Anti-Gravity Device
BB _9 -- Magneto (MN) -- destroy 21 tiles -- Iron Hammer
CC _9 -- Doctor Doom -- all -> -- Technopathic Strike
CC 10 -- Mystique -- ten tiles to -- Infiltration
FF 11 -- Doctor Octopus -- Manipulation
AA 12 -- Invisible Woman -- explode 3 locked tiles -- Force Field Crush
BB 10 -- Storm -- destroy 14 tiles -- Lightning Strike
CC _8 -- Wolverine X-Force -- destroy 15 tiles -- X-Force
CC 10 -- Rocket & Groot -- Blammo! We Got Ya!
CC 10 -- Hulk -- destroy 8+ tiles -- Thunderous Clap
CC 12 -- Storm (Classic) -- destroy 13+ tiles -- Lightning Storm
CC 14 -- Ragnarok -- destroy random column -- Godlike Power
CC 19 -- Black Widow (GS) -- choose reticle to destroy -- Sniper Rifle
DD 9 -- Beast -- Animal Inside
DD _8 -- Punisher -- destroy 3x3 -- Judgement
AA 10 -- StarLord -- choose tile -- Sleight of Hand (level 4)
BB _5 -- Iron Fist -- 9 tiles to -- Iron Fist of K'un-Lun
BB _5 -- Loki -- swap 32 tiles -- Illusions
BB _8 -- Kamala Khan -- chose color for 7 tiles to -- Inhuman Stretchiness
CC _9 -- Magneto (MN) -- 3 selected -> , 5 random -> -- Polarity Shift
FF 10 -- Daredevil -- Radar Sense
BB _9 -- Storm (Mohawk) -- create 32 attack tiles -- Hailstorm
BB 11 -- Wolverine X-Force -- destroy enemy's strong tiles -- Surgical Strike
BB 11 -- Quicksilver -- swap two tiles -- Idle Hands
CC 17 -- Moonstone -- control Countdown -- Control Shift

Rocket & Groot I Got a Plan - can place the CD tile on any basic tile (prob not quite what the OP is looking for)
Daken (2* and 3*) Chemical Reaction - converts to
Mystique Infiltration - converts or into or (amount varies per ability level)
Hulk Anger - converts basic tiles into (amount varies per ability level)