Totally new to builds, how does this look?

[Celtic Dagger]

I'm no expert, but trying to figure out what I'm doing well, and what I'm not seeing. Here is a build I've been working on.

 

This Villain build was built using Mids Reborn 3.2.17
https://github.com/LoadedCamel/MidsReborn

Click this DataLink to open the build!

Colonel Delicuts: Level 50 Science Stalker
Primary Power Set: Ninja Blade
Secondary Power Set: Fiery Aura
Power Pool: Experimentation
Power Pool: Speed
Ancillary Pool: Body Mastery

Villain Profile:
Level 1: Sting of the Wasp -- StlGl-Acc/Dmg(A), StlGl-Dmg/Rchg(3), StlGl-Acc/Dmg/Rchg(3), StlGl-Dmg/EndRdx/Rchg(5), StlGl-Rchg/Hide%(5), StlGl-Acc/Dmg/EndRdx/Rchg(7)
Level 1: Hide -- LucoftheG-Def/Rchg+(A), Rct-ResDam%(43)
Level 2: Fire Shield -- Ags-Psi/Status(A), Ags-ResDam(7), Ags-ResDam/EndRdx/Rchg(9), Ags-ResDam/EndRdx(9)
Level 4: Flashing Steel -- Arm-Dmg(A), Arm-Dmg/Rchg(40), Arm-Acc/Dmg/Rchg(40), Arm-Acc/Rchg(42), Arm-Dmg/EndRdx(46), Arm-Dam%(46)
Level 6: Assassin's Blade -- BlsCol-Acc/Dmg(A), BlsCol-Dmg/EndRdx(37), BlsCol-Acc/Dmg/EndRdx(39), BlsCol-Acc/Dmg/Rchg(39), BlsCol-Dmg/EndRdx/Acc/Rchg(39), BlsCol-Rchg/HoldProc(40)
Level 8: Healing Flames -- Prv-Heal(A), Prv-Heal/EndRdx(11), Prv-EndRdx/Rchg(11), Prv-Heal/Rchg(13), Prv-Heal/Rchg/EndRdx(48), Prv-Absorb%(48)
Level 10: Temperature Protection -- ImpArm-ResPsi(A)
Level 12: Placate -- PrfZng-Dam%(A), PrfZng-Taunt/Rchg(13), PrfZng-Acc/Rchg(15), PrfZng-Taunt/Rchg/Rng(15)
Level 14: Speed of Sound -- BlsoftheZ-ResKB(A)
Level 16: Plasma Shield -- GldArm-3defTpProc(A), GldArm-ResDam(17), GldArm-End/Res(17), GldArm-Res/Rech/End(19)
Level 18: Divine Avalanche -- OvrFrc-Acc/Dmg(A), OvrFrc-Dmg/End/Rech(19), OvrFrc-Dam/KB(23), LucoftheG-Def(34), LucoftheG-Def/Rchg(37), LucoftheG-Def/Rchg+(37)
Level 20: Consume -- PrfShf-End%(A), PrfShf-EndMod/Acc(21), PrfShf-Acc/Rchg(21), PrfShf-EndMod/Rchg(23), PrfShf-EndMod/Acc/Rchg(45)
Level 22: Build Up -- AdjTrg-ToHit/Rchg(A), AdjTrg-Rchg(45)
Level 24: Experimental Injection -- NmnCnv-Heal/EndRdx/Rchg(A), NmnCnv-Heal/Rchg(25), NmnCnv-Regen/Rcvry+(25), NmnCnv-Heal(50)
Level 26: Soaring Dragon -- Mk'Bit-Acc/Dmg(A), Mk'Bit-Dmg/EndRdx(27), Mk'Bit-Dmg/Rchg(27), Mk'Bit-Acc/EndRdx/Rchg(31), Mk'Bit-Acc/Dmg/EndRdx/Rchg(31), Mk'Bit-Dam%(31)
Level 28: Burn -- Obl-Dmg(A), Obl-Acc/Dmg/Rchg(29), Obl-%Dam(29), Obl-Dmg/Rchg(48), Obl-Acc/Dmg/EndRdx/Rchg(50)
Level 30: Adrenal Booster -- GssSynFr--ToHit/Rchg(A), GssSynFr--Rchg/EndRdx(43), GssSynFr--ToHit/Rchg/EndRdx(45), GssSynFr--Build%(46), GssSynFr--ToHit(50)
Level 32: Golden Dragonfly -- AssMar-Acc/Dmg(A), AssMar-Dmg/Rchg(33), AssMar-Acc/Dmg/Rchg(33), AssMar-Dmg/EndRdx/Rchg(33), AssMar-Acc/Dmg/EndRdx/Rchg(34), AssMar-Rchg/Rchg Build Up(34)
Level 35: Cauterizing Blaze -- Pnc-EndRdx/Rchg(A), Pnc-Heal/EndRedux/Rchg(36), Pnc-Heal/Rchg(36), Pnc-Heal(36), Pnc-Heal/EndRedux(43)
Level 38: Rise of the Phoenix -- RechRdx-I(A)
Level 41: Hasten -- RechRdx-I(A), RechRdx-I(42), RechRdx-I(42)
Level 44: Superior Conditioning -- EndMod-I(A)
Level 47: Focused Accuracy -- RctRtc-Pcptn(A)
Level 49: Physical Perfection -- EndMod-I(A)
Level 1: Assassination 
Level 1: Brawl -- PndSlg-Stun%(A)
Level 1: Sprint -- Spr-EndRdx/Jump(A)
Level 2: Rest -- IntRdx-I(A)
Level 1: Swift -- Run-I(A)
Level 1: Hurdle -- Jump-I(A)
Level 1: Health -- Pnc-Heal/+End(A)
Level 1: Stamina -- PrfShf-End%(A)
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[tidge]

It wouldn't be my approach to the build, but the only piece of common wisdom that I think you are cutting against is putting the %Hide piece (and set) in the T1 power instead of in Assassin's Blade. The consensus opinion is to have the %Hide in the attack that would become slow when you are hidden so as to not slow down your attack chain.

 

I use the Experimentation pool frequently, I wouldn't use all those slots in Experimental Injection. I typically just use it as a mule for Preventive Medicine... but you already have that (set) elsewhere. I'm not crazy about the Numina set bonuses (except for 2x on Tankers). You won't get the Regeneration/Recovery bonus unless you use the power. Are you sure you wouldn't rather move that piece to an auto/toggle power (e.g. Health) instead?

 

Without recommending a radical change to the build, I'd suggest replacing Experimental Injection with Toxic Dart, as there are several useful set bonuses that can be had from a ranged attack. I typically only slot Adrenal Booster with 2xrecharge IOs, as I think it has far too long of a recharge to invest the Gaussian's set in. That set is best in the Primary's Build Up IMO, as you should have that power ready every 30 seconds or so (or less, depending on Global recharge bonuses).

[Celtic Dagger]

Thank you for all the suggestions! I made some edits based on what you said here it is,

 

This Villain build was built using Mids Reborn 3.2.17
https://github.com/LoadedCamel/MidsReborn

Click this DataLink to open the build!

Colonel Delicuts: Level 50 Science Stalker
Primary Power Set: Ninja Blade
Secondary Power Set: Fiery Aura
Power Pool: Experimentation
Power Pool: Speed
Ancillary Pool: Body Mastery

Villain Profile:
Level 1: Sting of the Wasp -- AssMar-Rchg/Rchg Build Up(A), AssMar-Acc/Dmg/EndRdx/Rchg(3), AssMar-Dmg/EndRdx/Rchg(3), AssMar-Acc/Dmg/Rchg(5), AssMar-Dmg/Rchg(5), AssMar-Acc/Dmg(7)
Level 1: Hide -- LucoftheG-Def/Rchg+(A), Rct-ResDam%(7)
Level 2: Fire Shield -- Ags-Psi/Status(A), Ags-ResDam(9), Ags-ResDam/EndRdx/Rchg(11), Ags-ResDam/EndRdx(11)
Level 4: Flashing Steel -- Obl-%Dam(A), Obl-Acc/Dmg/EndRdx/Rchg(13), Obl-Acc/Dmg/Rchg(13), Obl-Dmg/Rchg(15), Obl-Acc/Rchg(15), Obl-Dmg(17)
Level 6: Assassin's Blade -- StlGl-Rchg/Hide%(A), StlGl-Acc/Dmg/EndRdx/Rchg(17), StlGl-Dmg/EndRdx/Rchg(19), StlGl-Acc/Dmg/Rchg(19), StlGl-Dmg/Rchg(21), StlGl-Acc/Dmg(21)
Level 8: Healing Flames -- Prv-Heal(A), Prv-Heal/EndRdx(23), Prv-EndRdx/Rchg(23), Prv-Heal/Rchg(25), Prv-Heal/Rchg/EndRdx(25), Prv-Absorb%(27)
Level 10: Temperature Protection -- ImpArm-ResPsi(A)
Level 12: Placate -- PrfZng-Dam%(A), PrfZng-Taunt/Rchg(27), PrfZng-Acc/Rchg(29), PrfZng-Taunt/Rchg/Rng(29)
Level 14: Speed of Sound -- BlsoftheZ-ResKB(A)
Level 16: Plasma Shield -- GldArm-3defTpProc(A), GldArm-ResDam(31), GldArm-End/Res(31), GldArm-Res/Rech/End(31)
Level 18: Divine Avalanche -- OvrFrc-Acc/Dmg(A), OvrFrc-Dmg/End/Rech(33), OvrFrc-Dam/KB(33), LucoftheG-Def/Rchg(33), LucoftheG-Def/Rchg+(34)
Level 20: Consume -- PrfShf-End%(A), PrfShf-EndMod/Acc(34), PrfShf-Acc/Rchg(34), PrfShf-EndMod/Rchg(36), PrfShf-EndMod/Acc/Rchg(36)
Level 22: Build Up -- GssSynFr--Build%(A), GssSynFr--ToHit/Rchg(36), GssSynFr--ToHit/Rchg/EndRdx(37), GssSynFr--Rchg/EndRdx(37), GssSynFr--ToHit(37)
Level 24: Toxic Dart -- Apc-Dam%(A), Apc-Acc/Rchg(39), Apc-Dmg/Rchg(39), Apc-Dmg(39), Apc-Acc/Dmg/Rchg(40)
Level 26: Soaring Dragon -- Mk'Bit-Acc/Dmg(A), Mk'Bit-Dmg/EndRdx(40), Mk'Bit-Dmg/Rchg(40), Mk'Bit-Acc/EndRdx/Rchg(42), Mk'Bit-Acc/Dmg/EndRdx/Rchg(42), Mk'Bit-Dam%(42)
Level 28: Burn -- Obl-Dmg(A), Obl-Acc/Dmg/Rchg(43), Obl-%Dam(43), Obl-Dmg/Rchg(43), Obl-Acc/Dmg/EndRdx/Rchg(45)
Level 30: Adrenal Booster -- RechRdx-I(A)
Level 32: Golden Dragonfly -- Obl-%Dam(A), Obl-Acc/Dmg/EndRdx/Rchg(48), Obl-Acc/Dmg/Rchg(48), Obl-Dmg/Rchg(50), Obl-Acc/Rchg(50), Obl-Dmg(50)
Level 35: Cauterizing Blaze -- Pnc-EndRdx/Rchg(A), Pnc-Heal/EndRedux/Rchg(45), Pnc-Heal/Rchg(45), Pnc-Heal(46), Pnc-Heal/EndRedux(46)
Level 38: Rise of the Phoenix -- RechRdx-I(A)
Level 41: Hasten -- RechRdx-I(A), RechRdx-I(46), RechRdx-I(48)
Level 44: Superior Conditioning -- EndMod-I(A)
Level 47: Focused Accuracy -- RctRtc-Pcptn(A)
Level 49: Physical Perfection -- EndMod-I(A)
Level 1: Assassination 
Level 1: Brawl -- PndSlg-Stun%(A)
Level 1: Sprint -- Spr-EndRdx/Jump(A)
Level 2: Rest -- IntRdx-I(A)
Level 1: Swift -- Run-I(A)
Level 1: Hurdle -- Jump-I(A)
Level 1: Health -- Pnc-Heal/+End(A), NmnCnv-Regen/Rcvry+(9)
Level 1: Stamina -- PrfShf-End%(A)
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Edited May 17 by Celtic Dagger