The Ghostlight Express

Trample
When The Ghostlight Express enters, sacrifice any number of permanents. The Ghostlight Express gets +1/+1 for each black creature in your graveyard.
Whenever The Ghostlight Express attacks, exile a black creature from your graveyard. If you cannot, sacrifice The Ghostlight Express.

"All aboard the Ghostlight Express. Lets get you settled in, you've got some friends to meet."
-The Vagrant