Goblin Bomber

Riot (This creature enters the battlefield with your
choice of a +1/+1 counter or haste.)
Whenever Goblin Bomber attacks, flip a coin.
If you win the flip, destroy target artifact. If you
lose the flip, until end of turn, Goblin Bomber
gains "When Goblin Bomber dies, it deals 2
damage to each creature," then it deals 3 damage
to itself.
"A day without explosion is a day wasted."