If you establish any of the myriad loops that cast spells over and over, you win
Since there are so many strong monocolor mana ramp options and mana rocks to choose from across Magics history, a multicolor card has to really bring something special to the table to stand out, especially if green is in its color identity
Others particularly older ones tied to a specific event that didnt happen again are genuinely hard to track down

Advanced Search Sets Random Syntax Aardvark Sloth Adaptive Snapjaw Aeromoeba Affectionate Indrik Alms Beast Alpha Tyrranax Altanak, the Thrice-Called Anara, Wolvid Familiar Anurid Barkripper Anurid Brushhopper Anurid Murkdiver Anurid Scavenger Anurid Swarmsnapper Aquamoeba Aquus Steed Arashin War Beast Arborback Stomper Arboreal Grazer Arc-Slogger Arcbound Hybrid Arcbound Lancer Arcbound Ravager Armguard Familiar Armored Scrapgorger Ashen Firebeast Assault Zeppelid Aura Gnarlid Auspicious Starrix Avarax Axebane Beast Axebane Ferox Baloth Gorger Baloth Null Baloth Packhunter Baloth Prime Baloth Pup Baloth Woodcrasher Bannerhide Krushok Barbarian Outcast Barkhide Mauler Bashful Beastie Batterhorn Battering Craghorn Battering Krasis Battlefront Krushok Bazaar Krovod Beacon Behemoth Beast Walkers Beast in Show Beasts of Bogardan Bedhead Beastie Berserk Murlodont Blastoderm Blight-Breath Catoblepas Blind Creeper Bloated Contaminator Bloodstoke Howler Blossoming Bogbeast Bog Gnarr Bogstomper Bonded Herdbeast Bonethorn Valesk Boneyard Lurker Book Devourer Boot Nipper Bounding Felidar Brackish Trudge Branchsnap Lorian Brokkos, Apex of Forever Brokkos, Apex of Forever Brontotherium Broodstar

Though he is eventually able to seal his dark side away, nothing may be forever
But what about an infinite mana combo for those Johnny, Jenny, and Jacky players