Casualty, The Cost Of Doing Business Casualty is the kind of mechanic that perfectly captures why Magic design continues to work even after three decades

WHITE | BLUE | BLACK | RED | GREEN MULTICOLORED | ARTIFACT | LAND | ALL CARDS WHITE Fey Steed Holy Avenger Immovable Rod Mantle of the Ancients Radiant Solar Revivify Robe of Stars Thorough Investigation Valiant Endeavor Angel of Finality Angelic Gift Cataclysmic Gearhulk Eternal Dragon Gryff's Boon Karmic Guide Puresteel Paladin Realm-Cloaked Giant Ronom Unicorn Sram, Senior Edificer Sun Titan Sunblast Angel Swords to Plowshares Valorous Stance Wall of Omens Winds of Rath BLUE Arcane Endeavor Diviner's Portent Minn, Wily Illusionist Netherese Puzzle-Ward Phantom Steed Rod of Absorption Winged Boots Brainstorm Champion of Wits Curator of Mysteries Curse of Verbosity Eel Umbra Forbidden Alchemy Imprisoned in the Moon Merfolk Looter Mulldrifter Murder of Crows Phantasmal Image Prognostic Sphinx Propaganda Psychic Impetus Riverwise Augur Serum Visions BLACK Bag of Devouring Danse Macabre Death Tyrant Grave Endeavor Grim Hireling Hellish Rebuke Lorcan, Warlock Collector Wand of Orcus Chittering Witch Consuming Vapors Dead Man's Chest Doomed Necromancer Fiend of the Shadows Gonti, Lord of Luxury Hex Marionette Master Necromantic Selection Ogre Slumlord Phthisis Piper of the Swarm Plaguecrafter Pontiff of Blight Reassembling Skeleton Shriekmaw Unburial Rites Victimize RED Berserker's Frenzy Chaos Dragon Fiendlash Maddening Hex Reckless Endeavor Share the Spoils Vengeful Ancestor Wild-Magic Sorcerer Anger Apex of Power Bogardan Hellkite Chain Reaction Chaos Warp Commune with Lava Dark-Dweller Oracle Demanding Dragon Dire Fleet Daredevil Disrupt Decorum Dragonlord's Servant Dragonmaster Outcast Dream Pillager Etali, Primal Storm Gratuitous Violence Hoard-Smelter Dragon Ignite the Future Izzet Chemister Light Up the Stage Loyal Apprentice Magmaquake Opportunistic Dragon Outpost Siege Rile Scourge of Valkas Shiny Impetus Shivan Hellkite Skyline Despot Skyship Stalker Spit Flame Taurean Mauler Tectonic Giant Terror of Mount Velus Throes of Chaos Thunderbreak Regent Vandalblast Warstorm Surge Dragonspeaker Shaman GREEN Bag of Tricks Belt of Giant Strength Druid of Purification Indomitable Might Neverwinter Hydra Song of Inspiration Wild Endeavor Abundant Growth Acidic Slime Beast Within Chameleon Colossus Colossal Majesty Cultivate Decree of Savagery Explore Fertile Ground Garruk's Uprising Greater Good Heroic Intervention Kenrith's Transformation Kindred Summons Nature's Lore Paradise Druid Rampant Growth Rancor Return of the Wildspeaker Return to Nature Rishkar's Expertise Shamanic Revelation Utopia Sprawl Verdant Embrace Wild Growth MULTICOLORED Galea, Kindler of Hope Prosper, Tome-Bound Sefris of the Hidden Ways Vrondiss, Rage of Ancients Catti-Brie of Mithral Hall Dragonborn Champion Extract Brain Fevered Suspicion Hurl Through Hell Karazikar, the Eye Tyrant Klauth, Unrivaled Ancient Klauth's Will Midnight Pathlighter Nihiloor Ride the Avalanche Storvald, Frost Giant Jarl Wulfgar of Icewind Dale Ashen Rider Atarka, World Render Baleful Strix Bant Charm Bedevil Behemoth Sledge Bituminous Blast Cloudblazer Cold-Eyed Selkie Despark Fleecemane Lion Hostage Taker Knight of Autumn Necrotic Sliver Obsessive Stitcher Rakdos Charm Savage Ventmaw Shielding Plax Terminate Theater of Horrors Utter End Vanish into Memory ARTIFACT Bucknard's Everfull Purse Clay Golem Component Pouch Ebony Fly Sword of Hours Arcane Signet Argentum Armor Basilisk Collar Burnished Hart Chaos Wand Colossus Hammer Commander's Sphere Dragon's Hoard Explorer's Scope Fellwar Stone Gruul Signet Heirloom Blade Masterwork of Ingenuity Meteor Golem Mind Stone Moonsilver Spear Orazca Relic Rakdos Signet Sol Ring Solemn Simulacrum Swiftfoot Boots Sword of the Animist Talisman of Indulgence Unstable Obelisk Viridian Longbow Wayfarer's Bauble Lightning Greaves LAND Underdark Rift Arcane Sanctum Azorius Chancery Bant Panorama Bojuka Bog Canopy Vista Choked Estuary Cinder Glade Command Tower Crucible of the Spirit Dragon Darkwater Catacombs Desert Dimir Aqueduct Esper Panorama Exotic Orchard Flood Plain Foreboding Ruins Fortified Village Game Trail Geier Reach Sanitarium Grasslands Gruul Turf Halimar Depths Haven of the Spirit Dragon High Market Lumbering Falls Mishra's Factory Mortuary Mire Mossfire Valley Mosswort Bridge Nimbus Maze Orzhov Basilica Path of Ancestry Port Town Prairie Stream Rakdos Carnarium Seaside Citadel Shadowblood Ridge Simic Growth Chamber Skycloud Expanse Smoldering Marsh Spinerock Knoll Sungrass Prairie Sunken Hollow Tainted Peak Terramorphic Expanse Thriving Grove Thriving Heath Thriving Isle Thriving Moor Vitu-Ghazi, the City-Tree Zhalfirin Void WHITE | BLUE | BLACK | RED | GREEN MULTICOLORED | ARTIFACT | LAND | ALL CARDS

-1/-1 Counters As I explained above, we started by using -1/-1 counters in Lorwyn with the initial idea that creatures were being injured rather than killed, but it ended up feeling meaner, so we moved it off to Shadowmoor
That's the main reason we're not dealing with exact figures here, just a straightforward list of very good cards
If you want to use this to repeatedly recast Lion's Eye Diamond, you'll still need a way to mitigate the five life you pay for each loop, and you'll need a win condition