Knull

Deathouch
Bearer of the First Symbiote: {1}{b}{r}: create a
legendary enchantment named Necrosword with
"Attached creature has +2/+0, first strike, goad
and "{1}: Attach this enchantemnt to target
creature, activate this ability only as a sorcery"
Reign of Terror: Damage that would be dealt to
your opponents by creatures that are goaded
is doubled.