Raze Rocket

You can only play this card if you control your commander.
When Raze Rocket enters the battlefield put a gunpowder counter on it.
Whenever an artifact called C4 enters the battlefield put a gunpowder counter on this card.
{t}{3}: Put a gunpowder counter on this card
{t}: Deal damage equal to the number of gunpowder counters on this card to target player.
If at any time there are 7 or more counters on this card sacrifice it.