Reckless Assassin

When Reckless Assasin enters the battlefield, flip a coin. If you win the flip, destroy target creature. If you lose the flip, destroy a creature at random.
When Reckless Assasin dies, flip a coin. If you lose the flip, deal 3 damage divided as you chose among any number of creatures. If you lose the flip, deal 3 damage to a creature chosen at random.
Goblins don't make the best assassins...