Vys, The Witch That Loved Them

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.)
At the beginning of your combat step, you may
pay {2}, if you do, untap target creature and must
block this turn if able.

"You are asking why I do this? Why you are being
chased? Because my heart is shattered and I ran out
of tears, I trusted you, and you betrayed me"