Little Boy

Little Boy enters the battlefield under target opponents control and with 5 Fuze counters on it.
At the beginning of your upkeep, remove a Fuze counter from Little Boy.
Whenever Little Boy is the target of a spell or ability, counter it and put a Fuze counter on
Little Boy instead.
When Little Boy has no Fuze counters on it, sacrifice it, it deals 50 damage to you and each creature and planeswalker you control.