Carchar, Thief of the Ocean

Shroud, Islandwalk, First Strike
When Carchar enters the battlefield destroy target artifact an opponent controls.
{u/b}{u/b}: Put a +1/+1 counter onto Carchar
When Carchar dies create as many colorless Treasure artifact token with "{t}, Sacrifice this artifact: Add one mana of any color to your mana pool." equal to the amount of +1/+1 counters on him.