Doesn't Make the Cut

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These are cards that I feel are very powerful, but don't seem to make the cut very often.
This is a rather subjective deck; some of the cards here are played by lots of people, but don't seem to appear much around here.
 
Mana Acceleration (10): General (1): Spells (31): Sideboard (Omitted/Cut card ideas):
1 Obelisk of Bant 1 Progenitus 1 Citanul Flute 1 Norn's Annex
1 Obelisk of Esper   1 Colfenor's Urn 1 Alchemist's Refuge
1 Obelisk of Grixis Creatures (23): 1 Crawlspace 1 Mirrodin's Core
1 Obelisk of Jund 1 Etched Monstrosity 1 Door to Nothingness 1 Winding Canyons
1 Obelisk of Naya 1 Drogskol Reaver 1 Druidic Satchel 1 River of Tears
1 Spectral Searchlight 1 Lazav, Dimir Mastermind 1 Elbrus, the Binding Blade 1 Ancient Amphitheater
1 Vessel of Endless Rest 1 Lord of Extinction 1 Knowledge Vault 1 Maelstrom Pulse
1 Fatestitcher 1 Maelstrom Archangel 1 Kusari-Gama 1 Evil Twin
1 Birds of Paradise 1 Master Biomancer 1 Nemesis Mask 1 Timetwister
1 Tempt with Discovery 1 Rakdos, Lord of Riots 1 Obelisk of Alara 1 Recurring Insight
  1 Bringer of the Black Dawn 1 Seer's Sundial 1 Necropotence
Lands (35): 1 Coffin Queen 1 Urza's Blueprints 1 Diabolic Revelation
1 Crosis's Catacombs 1 Dark Impostor 1 Assemble the Legion 1 Ring of Three Wishes
1 Darigaaz's Caldera 1 Dread 1 Biomass Mutation 1 Gemstone Array
1 Dromar's Cavern 1 Massacre Wurm 1 Brilliant Ultimatum 1 Nimbus Maze
1 Rith's Grove 1 Pestilence Demon 1 Debt to the Deathless 1 Bad River
1 Treva's Ruins 1 Bringer of the Blue Dawn 1 Gaze of Granite 1 Flood Plain
1 Temple of Abandon 1 Ethersworn Adjudicator 1 Obzedat's Aid 1 Grasslands
1 Temple of Deceit 1 Lighthouse Chronologist 1 Sorin, Lord of Innistrad 1 Mountain Valley
1 Temple of Epiphany 1 Tomorrow, Azami's Familiar 1 Dark Prophecy 1 Rocky Tar Pit
1 Temple of Malady 1 Vesuvan Doppelganger 1 Dauthi Embrace 1 Platinum Angel
1 Temple of Mystery 1 Elderscale Wurm 1 Exquisite Blood 1 Havengul Lich
1 Temple of Silence 1 Avatar of Hope 1 Yawgmoth's Will 1 Moonveil Dragon
1 Temple of Triumph 1 Blazing Archon 1 Back from the Brink 1 Merciless Eviction
1 Temple of Enlightenment 1 Darien, King of Kjeldor 1 Equilibrium 1 Wargate
1 Temple of Malice 1 Sunblast Angel 1 Thought Reflection  
1 Temple of Plenty   1 Foster  
1 Blackcleave Cliffs   1 Gutter Grime  
1 Copperline Gorge   1 Praetor's Counsel  
1 Darkslick Shores   1 Mindmoil  
1 Razorverge Thicket   1 Worship  
1 Seachrome Coast      
1 Cascade Bluffs      
1 Fetid Heath      
1 Fire-Lit Thicket      
1 Flooded Grove      
1 Graven Cairns      
1 Mystic Gate      
1 Rugged Prairie      
1 Sunken Ruins      
1 Twilight Mire      
1 Wooded Bastion      
1 City of Brass      
1 Forbidden Orchard      
1 Grand Coliseum      
1 Rupture Spire      
1 Transguild Promenade