The Butchers Nail's

Enchant creature
Enchanted creature gets +2/+2, has first strike,
and can't attack you or planeswalkers you control.

The cortical implants known as the Butcher's
Nails greatly boosted a warrior's adrenaline, resulting
in greater strength and aggression in battle. Under the perverse influence of the implants, killing proved exhilarating in a way nothing else could be