One could argue that Jumbo Cactuar is not broken at all, and that there are already some very powerful cards that can single-handedly win a game even without 10,000 power, and that is true
Full Decklist 4 Mountain 9 Plains Adarkar Wastes Aether Channeler Aetherize Agate Instigator Angel of the Ruins Arcane Signet Arthur, Marigold Knight Azorius Signet Battlefield Forge Bident of Thassa Blade Splicer Boros Signet Boss's Chauffeur Calamity of Cinders Cascade Bluffs Castle Ardenvale Chart a Course Circuit Mender Clifftop Retreat Cloudblazer Combat Celebrant Command Tower Curiosity Crafter Cut a Deal Devilish Valet Dusk // Dawn Echoing Assault Elspeth, Sun's Champion Evolving Wilds Exotic Orchard Fellwar Stone Ferrous Lake Fortune Teller's Talent Glacial Fortress Hanged Executioner Helm of the Host Illusory Ambusher Inferno Titan Inspiring Overseer Izzet Signet Jacked Rabbit Jazal Goldmane Junk Winder Loyal Warhound Luminous Broodmoth Martial Coup Mind Stone Murmuration Mystic Monastery Ornithopter of Paradise Path of Ancestry Path to Exile Plumecreed Escort Pollywog Prodigy Pull from Tomorrow Rapid Augmenter Rapid Hybridization Restoration Angel Rose Room Treasurer Rowdy Research Rugged Prairie Seachrome Coast Selfless Spirit Shield Broker Shivan Reef Siege-Gang Commander Skyclave Apparition Skycloud Expanse Sol Ring Solemn Simulacrum Spirited Companion Stolen by the Fae Storm of Souls Sulfur Falls Sun Titan Sunscorched Divide Temple of Enlightenment Temple of Epiphany Temple of Triumph Terramorphic Expanse Tetsuko Umezawa, Fugitive Thopter Engineer Thriving Bluff Thriving Heath Thriving Isle Time Wipe Zinnia, Valley's Voice Animated Army Expending is a big part of the red/green archetype in Bloomburrow, where you want to spend as much mana as possible
The next Secret Lair drop deserves a special shout out, because all of the cards contained within are EDH staples found in the majority of MTG Commander decks
Similarly, if the main disadvantage of an effect is your opponent playing around it, in an open-decklist tournament, playing only one can be correct to force opponents to respect it with the minimum amount of investment
