Darksaber

Equipped creature has +3/+3 and double strike
Whenever equipped creature dies, destroy target creature with toughness 3 or less
Equip {3}({3}: Attach to target creature you control.
Equip only as a sorcery.)
"Anyone can hold the Darksaber. The trick is keeping
it, along with your head."
- Ursa Wren to Sabine Wren