Powder, Short Fuse

Whenever an artifact enters the battlefield
tapped under your control, you may have it
deal 1 damage to you. When you do, untap it.
It gains haste.
{3}{r}, {t}: Create a Bomb token.
(It's an artifact with "This enters the battlefield
tapped." and "{1}, {t}: Sacrifice this artifact:
It deals 2 damage to any target.")
"I only wanted to help!"