Because damage remains marked on a creature until the cleanup step or an effect removes that damage, nonlethal damage dealt to a creature may become lethal if you switch its power and toughness during that turn
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That alone saves this from being basically unplayable
At the cost of his own life, Zack Fair can move his counters and Equipment to another creature for one mana, which can be exploited via certain Equipment like Mithril Coat
Its not that you need the cost reduction in Green in order to cast big spells

Normally, we go through the cards first, but I think we can start with the list on this one: Nahiri, the Lithomancer | Commander | Mark Wischkaemper Commander (1) 1 Nahiri, the Lithomancer Creatures (16) 1 Archivist of Oghma 1 Ardenn, Intrepid Archaeologist 1 Danitha Capashen, Paragon 1 Deep Gnome Terramancer 1 Halvar, God of Battle 1 Indomitable Archangel 1 Leonin Abunas 1 Leonin Shikari 1 Mentor of the Meek 1 Puresteel Paladin 1 Rumor Gatherer 1 Sram, Senior Edificer 1 Stone Haven Outfitter 1 Stonehewer Giant 1 Sun Titan 1 Welcoming Vampire Instants (2) 1 Path to Exile 1 Swords to Plowshares Sorceries (5) 1 Austere Command 1 Phyrexian Rebirth 1 Single Combat 1 Steelshaper's Gift 1 Winds of Abandon Enchantments (4) 1 Anointed Procession 1 Divine Visitation 1 Sigarda's Aid 1 Smuggler's Share Artifacts (32) 1 Archaeomancer's Map 1 Argentum Armor 1 Blackblade Reforged 1 Bonder's Ornament 1 Colossus Hammer 1 Commander's Plate 1 Hedron Archive 1 Kaldra Compleat 1 Lantern of Revealing 1 Loxodon Warhammer 1 Mace of the Valiant 1 Magnifying Glass 1 Mask of Memory 1 Maul of the Skyclaves 1 Mind Stone 1 Network Terminal 1 Rogue's Gloves 1 Seraphic Greatsword 1 Skullclamp 1 Sol Ring 1 Sword of Body and Mind 1 Sword of Feast and Famine 1 Sword of Fire and Ice 1 Sword of Hearth and Home 1 Sword of Light and Shadow 1 Sword of Sinew and Steel 1 Sword of the Animist 1 Sword of Truth and Justice 1 Sword of Vengeance 1 Sword of War and Peace 1 Thaumatic Compass 1 Worn Powerstone Elephant in the room: no Stoneforge Mystic
