Oryx, the Taken King

Blight (Whenever a creature blocks this creature, this creature gets +1/+1 until end of turn and the blocking creature gets -1/-1 until end of turn.)
When a creature enters the battlefield under your control, you may pay {w}{b}. If you do, that
creature gains blight.
Whenever a creature with blight is blocked by a creature without blight, you may pay 3 life. If you
do, create a token that's a copy of it.