High Utility, Low Price Myr Retriever Dualcaster Mage Feldon of the Third Path Solemn Simulacrum Steel Hellkite Myr Battlesphere Tyrants Familiar Faithless Looting Chaos Warp Wayfarers Bauble Fire Diamond Swiftfoot Boots Dreamstone Hedron Ahhh, Dualcaster Mage, the creature that goes infinite with any kind of copy target creature spells
Lurrus specifically and companions in general almost immediately broke the game, dominating quite literally every format in existence until Wizards was forced to take the unprecedented step of errata'ing the entire mechanic by essentially adding a three-mana tax to companions
Collectability-wise it should rank better, but price takes it beyond many budgets
Now I just need to actually find a group who want to play against it
A real-world application of this type of analysis could be the foreign exchange market responding to, say, a change in interest rates, but here Ill use the much simpler example of the price of Magic: The Gathering cards after a reprint