Weaken Opponent

Click here for visual deck (with images)
Click here for my EDH Commander decks
 
Hoser cards, bent more towards creatures and less towards pillow forting.
"Opponent can't" cards (can't gain life, can't tutor, etc.)
Detain
Archetype creatures (remove keywords)
Skip steps/phases
Shrink opponent's creatures
The partner generals are just for the colors; anything would work here.
 
Mana Acceleration (12): General (2): Spells (16): Sideboard (Omitted/Cut card ideas):
1 Cryptolith Fragment // Aurora of Emrakul 1 Silas Renn, Seeker Adept 1 Contagion Engine 1 Exhaustion
1 Commander's Sphere 1 Akiri, Line-Slinger 1 Phyrexian Splicer 1 Plagiarize
1 Gilded Lotus   1 Ward of Bones 1 Havoc Festival
1 Hierophant's Chalice Creatures (34): 1 Everlasting Torment 1 Cumber Stone
1 Jeskai Banner 1 Void Winnower 1 Rain of Gore 1 Dampening Pulse
1 Mardu Banner 1 Watchdog 1 Teferi's Moat 1 Glaring Spotlight
1 Meteorite 1 Archon of the Triumvirate 1 Liliana, Death Wielder 1 Boros Battleshaper
1 Prismatic Geoscope 1 Gwafa Hazid, Profiteer 1 Painful Quandary 1 Brutal Hordechief
1 Unstable Obelisk 1 Haunter of Nightveil 1 Sudden Spoiling 1 Rhystic Study
1 Vessel of Endless Rest 1 Kaervek the Merciless 1 Dismiss into Dream 1 Mind's Dilation
1 Grand Arbiter Augustin IV 1 Kambal, Consul of Allocation 1 Jace, Unraveler of Secrets 1 Arcane Lighthouse
1 Tezzeret the Schemer 1 Kulrath Knight 1 Polymorphist's Jest 1 Blighted Fen
  1 Lavinia of the Tenth 1 Leyline of Punishment 1 Field of Ruin
Lands (36): 1 New Prahv Guildmage 1 Stranglehold 1 Ifnir Deadlands
1 Underground Sea 1 Notion Thief 1 Martial Law 1 Hammerheim
1 Badlands 1 Sen Triplets 1 Overwhelming Splendor 1 Leechridden Swamp
1 Tundra 1 The Scorpion God   1 Mystifying Maze
1 Scrubland 1 Vish Kal, Blood Arbiter   1 Ramunap Ruins
1 Volcanic Island 1 Archetype of Finality   1 Shivan Gorge
1 Plateau 1 Erebos, God of the Dead   1 Skyline Cascade
1 Watery Grave 1 Massacre Wurm   1 Tectonic Edge
1 Blood Crypt 1 Ob Nixilis, Unshackled   1 Tolaria
1 Hallowed Fountain 1 Smog Elemental   1 Urborg
1 Godless Shrine 1 Archetype of Imagination    
1 Steam Vents 1 Brine Elemental    
1 Sacred Foundry 1 Fatespinner    
1 Sunken Ruins 1 Teferi, Mage of Zhalfir    
1 Graven Cairns 1 Archetype of Aggression    
1 Mystic Gate 1 Urabrask the Hidden    
1 Fetid Heath 1 Angelic Arbiter    
1 Cascade Bluffs 1 Archetype of Courage    
1 Rugged Prairie 1 Aven Mindcensor    
1 Crumbling Necropolis 1 Blinding Angel    
1 Arcane Sanctum 1 Elesh Norn, Grand Cenobite    
1 Nomad Outpost 1 Grand Abolisher    
1 Mystic Monastery 1 Iona, Shield of Emeria    
1 Command Tower 1 Linvala, Keeper of Silence    
1 Path of Ancestry 1 Yosei, the Morning Star    
1 Reflecting Pool      
1 Spinerock Knoll      
1 Windbrisk Heights      
2 Swamp      
2 Island      
2 Mountain      
2 Plains      
1 Sol Ring