Tenebris the Conqueror

First strike, lifelink, menace, vigilance
Whenever a creature you control deals combat damage to an opponent you may pay {1}{b}{b}, if you do, create a 2/2 black Knight creature token with lifelink and menace.
Whenever a creature deals combat damage to you, you may pay {1}{w}{w}, if you do, create a 2/2 white Knight creature token with first strike and vigilance.