Ok so I have a pretty good Grenzo deck I use on arena and it's cool. But I need to upgrade it to some of the new set. 

Here my list of cards and I have a pretty good win rate
Commander
1 Grenzo, Crooked Jailer (Y24) 22
Creatures
1 Dualcaster Mage (JMP) 313
1 Fury (SPG) 47
1 Grief (SPG) 46
1 Harvester of Misery (BIG) 9
1 Impetuous Lootmonger (Y24) 12
1 Nethergoyf (MH3) 103
1 Prosper, Tome-Bound (HBG) 247
1 Ragavan, Nimble Pilferer (MUL) 86
1 Razorkin Needlehead (DSK) 153
1 Screaming Nemesis (DSK) 157
1 Sheoldred, the Apocalypse (DMU) 107
Instants
1 Abrade (VOW) 139
1 Ashnod's Intervention (BRO) 85
1 Bitter Triumph (LCI) 91
1 Chaos Warp (STA) 36
1 Cut Down (DMU) 89
1 Dark Ritual (STA) 26
1 Electroduplicate (FDN) 85
1 Fatal Push (KLR) 84
1 Feign Death (AFR) 103
1 Fell the Profane (MH3) 244 (MDFC)
1 Infernal Grasp (MID) 107
1 Lightning Bolt (STA) 42
1 Malakir Rebirth (ZNR) 111 (MDFC)
1 Not Dead After All (WOE) 101
1 Sheoldred's Edict (ONE) 108
1 Withering Torment (DSK) 124
Sorceries
1 Angrath's Rampage (WAR) 185
1 Bail Out (Y25) 7
1 Bedevil (RNA) 157
1 Burn Down the House (MID) 131
1 Damnation (SPG) 68
1 Duress (STA) 29
1 Feed the Swarm (ZNR) 102
1 Grave Expectations (Y24) 9
1 Mind Spike (HBG) 46
1 Mizzium Mortars (PIO) 376
1 Molten Collapse (LCI) 234
1 Molten Duplication (BIG) 14
1 Night's Whisper (J25) 471
1 Reanimate (OTP) 18
1 Shatterskull Smashing (ZNR) 161 (MDFC)
1 Spectacle of Destruction (Y25) 8
1 Thought Distortion (M20) 117
1 Thoughtseize (AKR) 127
1 Toxic Deluge (MH3) 277
Artifacts
1 A-The One Ring (LTR) 246
1 Arcane Signet (ANB) 117
1 Chromatic Lantern (GRN) 233
1 Coldsteel Heart (CSP) 136
1 Cursed Mirror (MH3) 279
1 Hedron Archive (JMP) 468
1 Mind Stone (WTH) 153
1 Phial of Galadriel (LTR) 248
1 Ring of the Lucii (FIN) 269
1 Runecarved Obelisk (Y24) 30
1 Worn Powerstone (USG) 318
Enchantments
1 Blood Moon (WOT) 40
1 Nowhere to Run (DSK) 111
1 Sporogenic Infection (DSK) 117
Planeswalkers
1 Chandra, Torch of Defiance (KLR) 117
Lands
1 Arena of Glory (MH3) 215
1 Arid Mesa (MH2) 244
1 Blast Zone (WAR) 244
1 Blazemire Verge (DSK) 256
1 Blood Crypt (RNA) 245
1 Bloodstained Mire (KTK) 230
1 Boggart Trawler (MH3) 243 (MDFC)
1 Castle Locthwain (ELD) 241
1 Cavern of Souls (LCI) 269
1 Command Tower (ANB) 118
1 Geier Reach Sanitarium (SIR) 270
1 Ghost Quarter (ISD) 240
1 Mana Confluence (JOU) 163
1 Marsh Flats (MH2) 248
1 Mount Doom (LTR) 258
1 Polluted Delta (KTK) 239
1 Prismatic Vista (SPG) 38
1 Raucous Theater (MKM) 266
1 Scalding Tarn (MH2) 254
5 Snow-Covered Mountain (MH1) 253
7 Snow-Covered Swamp (MH1) 252
1 Sokenzan, Crucible of Defiance (NEO) 276
1 Sulfurous Springs (DMU) 256
1 Takenuma, Abandoned Mire (NEO) 278
1 Urborg, Tomb of Yawgmoth (PIO) 118
1 Urza's Cave (MH3) 234
1 Verdant Catacombs (MH2) 260
1 Wooded Foothills (KTK) 249

But I was wanting to upgrade it and use some newer cars or even cards I have forgotten about it can't remember. Magic just have so many fucking cards. 

But I do want to make this competitive as possible. Any suggestions would help and thank you. 

Need help upgrading and changing my Grenzo deck for brawl