Goldspan Dragon

The Treasure clause reads two ways at once, and both of them bend the usual economy of the game. Swinging in makes a Treasure, feeding the next spell or the next threat: that is the ramp everyone notices. The second trigger is the sharper one, because it inverts the usual math of removal. Pointing a spell at an opponent's five-drop is normally a clean trade: they lose the card, you spend one to answer it. This Dragon breaks that exchange. Aim any spell at it, whether that's their kill spell or your own pump effect, and it pays out a Treasure, so a one-for-one removal spell still leaves you holding mana the opponent effectively handed you. The static ability then upgrades every Treasure you own to two mana of a single color instead of one, which turns tokens meant for color fixing into genuine ramp; a Treasure left over from an earlier turn now casts a spell a full mana bigger than it should. Wrap that in a haste flier that starts pressuring the moment it resolves, generates mana against interaction, and bankrolls whatever comes next. The vulnerability that would normally balance a five-mana closer, the fact that it can be targeted and killed, is exactly the thing this card monetizes, which is why removing it rarely feels like a clean answer.