Mirrodin

Dead-Iron Sledge

Whenever equipped creature blocks or becomes blocked by a creature, destroy that creature and equipped creature.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery. This card comes into play unattached and stays in play if the creature leaves play.)

Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.)