Goblin Boomgineer

{1}{r},{t}: Flip a coin. If you win the flip, put a fuse counter on Goblin Boomgineer. If you lose the flip, remove a fuse counter from Goblin Boomgineer.
Remove five fuse counters from Goblin Boomgineer and sacrifice it: Goblin Boomgineer deals 20 damage to target player or planeswalker.
"This oughtta work!"