I PvP with a Thugs/Poison in RV on Infinity. Seems fine to me let me know how ya fair with it. I dont have Tough, Weave, or any travel powers. Its spec'd entirely for PvP. I'd slot more slots in Aid-Other if possible. It heals more and cost less endurance than Alkaloid. If ya run into smarter enemies ya may wanna try to get Presense Pool in there to keep enemies on you and not take down your thugs.
You shouldnt have ANY trouble with anyone 1v1 and 1v2 (most cases).
im very new at pvping with a MM, so take with a pinch of salt.
i would drop paralytic poison...not sure what i would take instead but even acro would be far better imo. i dont really like the set choices so much. it looks like you were trying to build up defence but if you are playing in the normal zone format you will be facing BIG DR issues way before most of this defence in applied, your 39-40% will get cut too around 15% at a rough guess (ouch!). if you plan on playing with DR off it would be fine as the defence wont get reduced then.
the soulbound allegiance wont work properly in the enforcers, they only work in level 50 pets, i know it is daft but that is how it is unfortunatly, i did the same thing and pmed castle about it for conformation.
i think you should get nuerotoxic breath, im not sure how badly -recharge is effected by DR but it is unlikely you will be playing against someone with no + recharge at all, so having the extra -recharge would be a plus.
i would take web cocoon over web envelope.
if you plan on taking combat jump i would go with hurdle. (although i quite like hover & swift on MMs myself)
hope this was of some help. 
Shenanigans
LotD - JaL - POWT/SMD - SoCo - AJs
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the soulbound allegiance wont work properly in the enforcers, they only work in level 50 pets, i know it is daft but that is how it is unfortunatly,
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Thanks for the tips, so the only one I can slot SB in is the tier 3?
Pleasure.
Yes, only tier 3 unless gang war spawns at your level and takes them ? i was going off my necro/poison for (little) experience. i was disappointed, had to burn a respec over the soulbound matter.
on a side note, if gang war does accept them and does spawn at level 50, splitting the set in two between bruiser and gang war might be useful, would get +6% hps out of it.
Shenanigans
LotD - JaL - POWT/SMD - SoCo - AJs
i've pvp'd on a poison since my ninja poison turned 20 and entered lolbloodybay 3 years ago. i actually ended up playing poison on the pvp ladder while it was enjoyable (prior to i13).
DO NOT TAKE TOUGH.
first off you need tactics.
you do not need weave.
and do not drop paralytic poison. having two holds is definitely worthwhile on the recharge both of them are at.
slot paralytic poison. get rid of fighting.
take tactics.
finally, don't slot 5 performance shifters into stamina, the damage bonus only applies to you, not the pets, and on a poison you won't be doing enough for it to be significant. those slots are best used elsewhere.
Didn't notice you didnt take Neurotoxic Breath but I would take it. I usually open a fight with it. Keep Paralytic Poison as ya need a mez to drop offensive toggles quick like Force Bubble, Hurricane kinda effects. I'd try to keep Web Cocoon and Web Envelope just for the -fly -slow powers. It works wonder keeping enemies from getting away (least those without Super Speed).
I haven't ever had a dedicated MM PvP build so I would love some expert help.
Villain Plan by Mids' Villain Designer 1.401
http://www.cohplanner.com/
[u]Click this DataLink to open the build![u]
Level 50 Magic Mastermind
Primary Power Set: Thugs
Secondary Power Set: Poison
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Medicine
Power Pool: Fighting
Ancillary Pool: Mace Mastery
Villain Profile:
Level 1: Call Thugs -- BldM'dt-Dmg(A), BldM'dt-Acc/Dmg(40), BldM'dt-Dmg/EndRdx(43), BldM'dt-Acc(45), BldM'dt-Acc/EndRdx(46), BldM'dt-Acc/Dmg/EndRdx(46)
Level 1: Alkaloid -- Numna-Regen/Rcvry+(A), Numna-Heal(31), Numna-Heal/EndRdx(33), Numna-EndRdx/Rchg(33), Numna-Heal/Rchg(43), Numna-Heal/EndRdx/Rchg(46)
Level 2: Envenom -- AnWeak-%ToHit(A), AnWeak-Acc/Rchg/EndRdx(3), AnWeak-DefDeb(3), AnWeak-Acc/DefDeb(9), AnWeak-Acc/Rchg(11), AnWeak-DefDeb/EndRdx/Rchg(11)
Level 4: Weaken -- SipInsght-%ToHit(A), SipInsght-Acc/EndRdx/Rchg(5), SipInsght-ToHitDeb(5), SipInsght-Acc/ToHitDeb(7), SipInsght-ToHitDeb/EndRdx/Rchg(7), SipInsght-Acc/Rchg(9)
Level 6: Equip Thugs -- EndRdx-I(A)
Level 8: Swift -- Run-I(A)
Level 10: Combat Jumping -- Krma-ResKB(A)
Level 12: Call Enforcer -- Achilles-ResDeb%(A), S'bndAl-Build%(13), S'bndAl-Dmg(13), S'bndAl-Dmg/Rchg(15), S'bndAl-Acc/Dmg/Rchg(15), S'bndAl-Acc/Rchg(40)
Level 14: Health -- RgnTis-Regen+(A)
Level 16: Super Jump -- Zephyr-Travel(A), Zephyr-Travel/EndRdx(17), Zephyr-ResKB(17)
Level 18: Gang War -- ExRmnt-+Res(Pets)(A), ExRmnt-EndRdx/Dmg/Rchg(19), ExRmnt-Acc/Rchg(19), ExRmnt-Acc/Dmg(23), ExRmnt-Dmg/EndRdx(39), ExRmnt-Acc/Dmg/Rchg(40)
Level 20: Stamina -- P'Shift-End%(A), P'Shift-EndMod/Acc(21), P'Shift-EndMod(21), P'Shift-EndMod/Rchg(23)
Level 22: Aid Other -- IntRdx-I(A)
Level 24: Aid Self -- IntRdx-I(A), IntRdx-I(25), IntRdx-I(25), Heal-I(34), Heal-I(34), Heal-I(37)
Level 26: Call Bruiser -- SvgnRt-PetResDam(A), SvgnRt-Acc(27), SvgnRt-Acc/Dmg(27), SvgnRt-Dmg/EndRdx(29), SvgnRt-Acc/EndRdx(29), SvgnRt-Acc/Dmg/EndRdx(34)
Level 28: Boxing -- Acc-I(A)
Level 30: Tough -- S'fstPrt-ResDam/Def+(A), S'fstPrt-ResKB(31), ResDam-I(31), ResDam-I(50)
Level 32: Upgrade Equipment -- EndRdx-I(A), EndRdx-I(33)
Level 35: Weave -- RedFtn-EndRdx(A), RedFtn-Def(36), RedFtn-Def/EndRdx(36), RedFtn-Def/Rchg(36), RedFtn-EndRdx/Rchg(37), RedFtn-Def/EndRdx/Rchg(37)
Level 38: Noxious Gas -- RechRdx-I(A), RechRdx-I(39), RechRdx-I(39)
Level 41: Web Envelope -- GravAnch-Acc/Rchg(A), GravAnch-Acc/Immob/Rchg(42), GravAnch-Immob(42), GravAnch-Hold%(42), GravAnch-Immob/EndRdx(43)
Level 44: Power Boost -- RechRdx-I(A), RechRdx-I(45), RechRdx-I(45)
Level 47: Scorpion Shield -- RedFtn-EndRdx(A), RedFtn-Def/EndRdx(48), RedFtn-Def(48), RedFtn-EndRdx/Rchg(48), RedFtn-Def/EndRdx/Rchg(50), RedFtn-Def/Rchg(50)
Level 49: Paralytic Poison -- Acc-I(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Supremacy