Trundle Patrol

Goldbrick (You may pay {0} instead of paying any or all of the colored mana costs of this spell. If you do, the next spell you cast costs that much more, and until then, you can't cast spells using alternative costs.)
Flash
At the beginning of your upkeep, each player chooses a permanent they control at random. Then, that player sacrifices it or target opponent gains control of it.