Pact of the Dark Path

When you cast Pact of the Dark Path, choose two
creatures you control. As long as you control both
creatures, each of them has +1/+1 and Vigilance.
If either creature leaves the battlefield, sacrifice
Pact of the Dark Path. If you do, the other
creature has +3/+3 until end of turn.
"If it takes evil to destroy evil, then let us become all
the evil in the world. And when only we remain, our
stain will be the last to ever curse this earth."