Cavern-Hoard Dragon

The printed cost reads as a nine-drop, but the reduction is where the design actually lives: it scales to the busiest artifact board across the table, and against a deck flooding the field with mana rocks, Treasure, and equipment, that number is rarely small. It can crater into a genuine tempo play, arriving with haste to swing the turn it resolves. What makes the card cohere is that both halves point at the same target: the reduction rewards you for opponents piling on artifacts, and the combat trigger punishes it, minting a Treasure for every artifact the player you hit controls. It turns an opponent's ramp into your own explosive mana, and Treasure begets more spells, which begets more attacks. The 6/6 flying trample body is almost incidental; the card is engineered to convert a wide artifact battlefield into an avalanche of Treasure. The tension is deliberate. Against a creature board with no artifacts, this is a dead nine-mana beater with nothing to reduce and nothing to steal. Against exactly the kind of artifact-dense ramp deck that would otherwise be racing ahead, it becomes a discounted, snowballing threat that pays you in the same currency it taxes. A Dragon built as a check on artifact excess, its whole rate contingent on the opponent having overbuilt the board it feeds on.