Tyrion Lannister, The Imp

Ward: Sacrifice Legendary Artifact.
When Tyrion Lannister enters the battlefield, create 4 Treasure tokens.
{t}: Create 4 Treasure tokens.
You may sacrifice {x} amount of treasure tokens to gain control of one of your opponents creatures until the end of the turn. This spell cannot be countered.
{x} Equals the target creatures mana value.