For me, the main competitors who at least reached this level will be the Pika trophies from 1997, Fuji says
YmPrat on Ayli's Recurring Nightmare 9 years ago Remove these creature cards: Whipgrass Entangler, Skirsdag High Priest,Rotlung Reanimator, Pulsemage Advocate, Pontiff of Blight, Order of Whiteclay, Edgewalker, Drana's Emissary, Celestial Gatekeeper, Cabal Archon, Beacon of Destiny, Battletide Alchemist, Banisher Priest, and maybe even Athreos, God of Passage.Most of them are in the deck to create a cleric subtheme, and provide little benefit by themselves

Academic Dispute Accelerate Aleatory Ambitious Assault Ancestral Anger Balduvian Rage Blindblast Bloody Betrayal Boiling Blood Brand Burnout Chandra's Defeat Change of Fortune Chaotic Strike Cleansing Wildfire Crash Through Crimson Wisps Cunning Maneuver Decree of Annihilation Deem Worthy Ember Shot Enthusiastic Study Expedite Explosion of Riches Faithless Salvaging Fiery Encore Fire // Ice Fire Prophecy Fires of Victory First Day of Class Fists of Flame Flame Jet Flamethrower Sonata Flare Flick a Coin Fuel the Flames Geomancer's Gambit Giant's Ire Go for Blood Gorilla War Cry Igneous Inspiration Ignorant Bliss Implode Impolite Entrance Incinerating Blast Inferno Jet Jet's Brainwashing Lacerate Flesh Lay Waste Limits of Solidarity Manhole Missile Might of the Meek Mishra's Command Mob Verdict Molten Frame Nahiri's Lithoforming Needle Drop Neonate's Rush Orcish Cannonade Overmaster Pack Attack Panic Playful Shove Price of Freedom Psychotic Fury Pursue Glory Pyrrhic Blast Raking Claws Raze to the Ground Renegade Tactics Reroute Resounding Thunder

You know whats cool to copy
Based on the latest market prices tracked on TCG Stacked, Iron Boulder is worth about $0.09 USD
This is to be expected as the manga - on which the anime is based - predated the card game, so the rules weren't as established as they are now