The Holy Hand Grenade

The Holy Hand Grenade enters the battlefield with three {e}.
{3}{t} Remove {e} and deal 5 damage to any target
When played against the Beast of Caerbannog, that card reverts to Tim the Enchanter and cannot transform again.
"And Saint Atila raised the hand grenade up on high saying, 'Oh, Lord, bless this thy hand grenade that with it thou mayest blow thy enemies to tiny bits, in thy mercy.'" -- Armaments, Chapter 2, Verse 9