I can give you the build I used to run but it was more for fun than anything. It really comes down to what epic mastery you want because the rest is fairly easy to build; Double proc flares using Apoc and glad javelin procs and either slot 4 devastation and 2 glad javelins (including a proc) or just full glad javelin set, depends on your budget.
I guess the best option would be to go with cold mastery and tough but I enjoy Knockout Blow because it reminds me of the old Bone Smasher damage but you could switch the epics and pool powers around but hopefully this will give you some idea 
...erm Bile spray is slotted purely for bonuses, you could use ragnaroks but I couldn't afford them at the time so...:P
Code:
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Morti.
"You wrote that the world doesn't need a saviour, but everyday I hear people cry for one"
Mortilance - Elec/WP Stalker
cheap no purples or pvp ios - get your accos and alpha at least...
Hero Plan by Mids' Hero Designer 1.952
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Magic Blaster
Primary Power Set: Fire Blast
Secondary Power Set: Energy Manipulation
Power Pool: Speed
Power Pool: Leaping
Power Pool: Leadership
Power Pool: Concealment
Ancillary Pool: Cold Mastery
Hero Profile:
Level 1: Flares -- Dev'n-Acc/Dmg(A), Dev'n-Acc/Dmg/Rchg(40), Dev'n-Acc/Dmg/EndRdx/Rchg(40), Dev'n-Hold%(43), HO:Nucle(43), HO:Nucle(45)
Level 1: Power Thrust -- Mako-Acc/Dmg(A), Mako-Dmg/EndRdx(46), Mako-Dmg/Rchg(46)
Level 2: Fire Blast -- Dev'n-Acc/Dmg/EndRdx/Rchg(A), Dev'n-Acc/Dmg(39), Dev'n-Acc/Dmg/Rchg(39), Dev'n-Hold%(39), HO:Nucle(40), HO:Nucle(46)
Level 4: Build Up -- AdjTgt-ToHit(A), AdjTgt-ToHit/EndRdx/Rchg(5), AdjTgt-ToHit/Rchg(7), AdjTgt-EndRdx/Rchg(11), AdjTgt-ToHit/EndRdx(37)
Level 6: Hasten -- RechRdx-I(A), RechRdx-I(7)
Level 8: Combat Jumping -- LkGmblr-Rchg+(A), Zephyr-ResKB(9), Krma-ResKB(9)
Level 10: Maneuvers -- LkGmblr-Rchg+(A), Krma-ResKB(11)
Level 12: Stealth -- LkGmblr-Rchg+(A), LkGmblr-Def/Rchg(13), LkGmblr-EndRdx/Rchg(13), Krma-ResKB(29)
Level 14: Tactics -- AdjTgt-ToHit(A), AdjTgt-ToHit/EndRdx/Rchg(15), AdjTgt-ToHit/Rchg(15), AdjTgt-EndRdx/Rchg(23), AdjTgt-ToHit/EndRdx(27)
Level 16: Super Jump -- SprngFt-Jump(A), SprngFt-EndRdx(17), SprngFt-EndRdx/Jump(17), Zephyr-ResKB(21)
Level 18: Super Speed -- Clrty-EndRdx(A), Clrty-RunSpd(19), Clrty-Stlth(19), Zephyr-ResKB(21)
Level 20: Acrobatics -- KBDist-I(A)
Level 22: Vengeance -- LkGmblr-Rchg+(A), Krma-ResKB(23)
Level 24: Invisibility -- LkGmblr-Rchg+(A), LkGmblr-Def/Rchg(25), LkGmblr-EndRdx/Rchg(25), Krma-ResKB(27)
Level 26: Phase Shift -- RechRdx-I(A)
Level 28: Power Boost -- RechRdx-I(A), RechRdx-I(29)
Level 30: Aim -- AdjTgt-ToHit/EndRdx/Rchg(A), AdjTgt-ToHit(31), AdjTgt-ToHit/Rchg(31), AdjTgt-EndRdx/Rchg(31), AdjTgt-ToHit/EndRdx(34)
Level 32: Blaze -- Dev'n-Hold%(A), Dev'n-Acc/Dmg/EndRdx/Rchg(33), Dev'n-Acc/Dmg/Rchg(33), Dev'n-Acc/Dmg(33), HO:Nucle(34), HO:Nucle(34)
Level 35: Blazing Bolt -- Mantic-Acc/Dmg(A), Mantic-Dmg/EndRdx(36), Mantic-Acc/ActRdx/Rng(36), ExtrmM-Dmg/ActRdx/Rchg(36), Mantic-Dam%(37), HO:Nucle(37)
Level 38: Boost Range -- RechRdx-I(A)
Level 41: Total Focus -- C'ngImp-Acc/Dmg(A), C'ngImp-Dmg/EndRdx(42), C'ngImp-Dmg/Rchg(42), C'ngImp-Acc/Dmg/Rchg(42), C'ngImp-Acc/Dmg/EndRdx(43)
Level 44: Snow Storm -- TmpRdns-Acc/Slow(A), TmpRdns-Acc/EndRdx(45), TmpRdns-EndRdx/Rchg/Slow(45)
Level 47: Hoarfrost -- Numna-Heal/EndRdx(A), Numna-EndRdx/Rchg(48), Numna-Heal/Rchg(48), Numna-Heal/EndRdx/Rchg(48)
Level 49: Frozen Armor -- Ksmt-ToHit+(A), ImpArm-ResPsi(50), Aegis-Psi/Status(50), S'fstPrt-ResKB(50)
Level 0: Portal Jockey
Level 0: Task Force Commander
Level 0: The Atlas Medallion
Level 0: Freedom Phalanx Reserve
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Level 2: Swift -- Run-I(A)
Level 2: Health -- Mrcl-Rcvry+(A), Numna-Regen/Rcvry+(5)
Level 2: Hurdle -- Jump-I(A)
Level 2: Stamina -- P'Shift-End%(A), P'Shift-EndMod(3), P'Shift-EndMod/Rchg(3)
Level 1: Brawl -- Empty(A)
Level 1: Defiance
Level 1: Sprint -- QckFt-EndRdx/RunSpd(A)
Level 2: Rest -- Empty(A)
Level 4: Ninja Run
I am fairly new at PVP and could use some feedback on the build i'm making and if someone could give me a mids build that would be amazing.