Taxpayer's Burden

Create a colorless Treasure artifact token with "{t}, Sacrifice this artifact: Add one mana of any color to your mana pool."
Counter target spell unless its controller pays {x}, where X is the number of Treasures you control.
"It's nothing personal, the bank just needs what it's owed. And until you can muster up the cost to pay your debt back, we'll be taking this as collateral."