Why Would You Want To Force a Block
Because each color now only has one enemy, this arrangement would likely cause a much larger focus to be placed on the enemy conflicts white vs black, red vs blue, and green vs purple

Abolisher of Bloodlines Adanto, the First Fort Ashling, Rekindled Ashling, Rimebound Assimilate Essence Atzal, Cave of Eternity Avacyn, the Purifier Awoken Horror Azcanta, the Sunken Ruin Barracks of the Thousand Black Chocobo Blight Titan Blighted Burgeoning Blightsower Thallid Bloated Processor Brigid, Clachan's Heart Brimaz, Blight of Oreskos Brutal Cathar Chrome Host Seedshark Compleated Conjurer Compleated Huntmaster Conqueror's Foothold Converter Beast Corruption of Towashi Cult of the Waxing Moon Curse of Leeches Deadly Dancer Demon-Possessed Witch Elvish Vatkeeper Essence of Orthodoxy Excise the Imperfect Eyes of Gitaxias Furnace Gremlin Geode Grotto Gift of Compleation Glissa, Herald of Predation Glistening Dawn Gold-Forge Garrison Grub, Storied Matriarch Hideous Fleshwheeler Huntmaster of the Fells Ichor Drinker Infected Defector Injector Crocodile Itlimoc, Cradle of the Sun Jurassic Park Lost Vale Lunarch Inquisitors Malady Invoker Marauding Dreadship Merciless Repurposing Metzali, Tower of Triumph Mycoid Maze Neglected Heirloom Norn's Inquisitor Olag, Ludevic's Hubris Phyrexian Awakening Primal Wellspring Progenitor Exarch Ravager of the Fells Revealing Eye Sanctum of the Sun Sculpted Perfection Searing Barb Sephiroth, One-Winged Angel Shadows' Lair Shinryu, Transcendent Rival Skyclave Invader Spires of Orazca Spitfire Bastion Sunder the Gateway Sunfall

Southern Paladin and Western Paladin probably need a raft of color changers like Scuttlemutt to be worth it
Dont think of this as an ending, but rather, an exciting beginning
each player with a hand shuffles their entire hand into the Deck, then draws the same number of cards they shuffled into the Deck