Raze Grenade

Tinkerers Invention (You may sacrifice artifacts to pay X costs for this card)
When Raze Grenade enters the battlefield deal X divided by two damage to target opponent and X damage divided by 3 to each creature that opponent controls. For each creature that dies this way create a C4 token with {t}{2}: Do three damage to any target. Sacrifice Raze Grenade if nothing died this way.
Whenever an artifact leaves the battlefield return Raze Grenade to your hand and paying {4}