Thank you so much for your help. Here is my current build:
Hero Plan by Mids' Hero Designer 1.95
http://www.cohplanner.com/
Frosted Bang: Level 50 Mutation Blaster
Primary Power Set: Ice Blast
Secondary Power Set: Ice Manipulation
Power Pool: Speed
Power Pool: Fighting
Power Pool: Flight
Power Pool: Medicine
Ancillary Pool: Cold Mastery
Hero Profile:
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Level 1: Ice Bolt
(A) Thunderstrike - Accuracy/Damage
(3) Thunderstrike - Damage/Recharge
(3) Thunderstrike - Accuracy/Damage/Recharge
(5) Thunderstrike - Accuracy/Damage/Endurance
(5) Thunderstrike - Damage/Endurance/Recharge
Level 1: Chilblain
(A) Enfeebled Operation - Accuracy/Recharge
(7) Enfeebled Operation - Endurance/Immobilize
(7) Enfeebled Operation - Accuracy/Endurance
(9) Enfeebled Operation - Immobilize/Range
(9) Enfeebled Operation - Accuracy/Immobilize
(11) Enfeebled Operation - Accuracy/Immobilize/Recharge
Level 2: Ice Blast
(A) Thunderstrike - Accuracy/Damage
(11) Thunderstrike - Damage/Recharge
(13) Thunderstrike - Accuracy/Damage/Recharge
(13) Thunderstrike - Accuracy/Damage/Endurance
(15) Thunderstrike - Damage/Endurance/Recharge
Level 4: Frost Breath
(A) Positron's Blast - Accuracy/Damage
(15) Positron's Blast - Damage/Recharge
(17) Positron's Blast - Accuracy/Damage/Endurance
(17) Positron's Blast - Damage/Endurance
(19) Positron's Blast - Damage/Range
Level 6: Hasten
(A) Recharge Reduction IO
(19) Recharge Reduction IO
(21) Recharge Reduction IO
Level 8: Freeze Ray
(A) Basilisk's Gaze - Accuracy/Hold
(21) Basilisk's Gaze - Accuracy/Recharge
(23) Basilisk's Gaze - Endurance/Recharge/Hold
(23) Basilisk's Gaze - Recharge/Hold
Level 10: Chilling Embrace
(A) Pacing of the Turtle - Endurance/Recharge/Slow
(48) Pacing of the Turtle - Accuracy/Endurance
(50) Pacing of the Turtle - Chance of -Recharge
Level 12: Ice Storm
(A) Positron's Blast - Accuracy/Damage
(25) Positron's Blast - Damage/Endurance
(25) Positron's Blast - Damage/Recharge
(27) Positron's Blast - Accuracy/Damage/Endurance
(27) Positron's Blast - Damage/Range
Level 14: Boxing
(A) Empty
Level 16: Tough
(A) Steadfast Protection - Resistance/Endurance
(29) Steadfast Protection - Knockback Protection
(29) Impervium Armor - Resistance/Endurance
(48) Steadfast Protection - Resistance/+Def 3%
Level 18: Bitter Ice Blast
(A) Devastation - Accuracy/Damage
(31) Devastation - Damage/Recharge
(31) Devastation - Damage/Endurance
(31) Devastation - Accuracy/Damage/Recharge
(33) Devastation - Accuracy/Damage/Endurance/Recharge
Level 20: Weave
(A) Luck of the Gambler - Defense/Endurance
(33) Luck of the Gambler - Defense/Endurance/Recharge
(33) Luck of the Gambler - Defense
(34) Luck of the Gambler - Endurance/Recharge
Level 22: Build Up
(A) Rectified Reticle - To Hit Buff
(34) Rectified Reticle - To Hit Buff/Recharge
(34) Recharge Reduction
Level 24: Ice Patch
(A) Empty
Level 26: Bitter Freeze Ray
(A) Neuronic Shutdown - Accuracy/Recharge
(36) Neuronic Shutdown - Endurance/Hold
(36) Neuronic Shutdown - Accuracy/Endurance
(36) Neuronic Shutdown - Hold/Range
(37) Neuronic Shutdown - Accuracy/Hold/Recharge
(37) Neuronic Shutdown - Chance of Damage(Psionic)
Level 28: Hover
(A) Luck of the Gambler - Defense/Endurance
(39) Kismet - Accuracy +6%
Level 30: Shiver
(A) Tempered Readiness - Accuracy/Slow
(37) Tempered Readiness - Damage/Slow
(39) Tempered Readiness - Accuracy/Endurance
(46) Tempered Readiness - Accuracy/Damage/Slow
(50) Tempered Readiness - Endurance/Recharge/Slow
Level 32: Blizzard
(A) Positron's Blast - Accuracy/Damage
(39) Positron's Blast - Damage/Endurance
(40) Positron's Blast - Damage/Recharge
(40) Positron's Blast - Accuracy/Damage/Endurance
(40) Positron's Blast - Damage/Range
Level 35: Freezing Touch
(A) Basilisk's Gaze - Accuracy/Hold
(42) Basilisk's Gaze - Accuracy/Recharge
(42) Basilisk's Gaze - Recharge/Hold
(42) Basilisk's Gaze - Endurance/Recharge/Hold
(50) Basilisk's Gaze - Accuracy/Endurance/Recharge/Hold
Level 38: Stimulant
(A) Empty
Level 41: Flash Freeze
(A) Hibernation - Accuracy/Recharge
Level 44: Frozen Armor
(A) Luck of the Gambler - Defense/Endurance
(45) Luck of the Gambler - Defense/Recharge
(46) Luck of the Gambler - Defense
(46) Luck of the Gambler - Endurance/Recharge
Level 47: Hoarfrost
(A) Recharge Reduction
(48) Recharge Reduction
Level 49: Hibernate
(A) Recharge Reduction
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Level 1: Brawl
(A) Empty
Level 1: Defiance
Level 1: Sprint
(A) Empty
Level 2: Rest
(A) Empty
Level 2: Swift
(A) Empty
Level 2: Health
(A) Miracle - Heal
(45) Miracle - +Recovery
(45) Numina's Convalescence - +Regeneration/+Recovery
Level 2: Hurdle
(A) Empty
Level 2: Stamina
(A) Performance Shifter - Accuracy/Recharge
(43) Performance Shifter - EndMod
(43) Performance Shifter - EndMod/Recharge
(43) Performance Shifter - Chance for +End
Level 4: Ninja Run