Marius Dor, Tharf's Bane

Flying.
Spirit, Ghost and Wraith creatures get +1/+1.
Whenever a non-Spirit, non-Ghost, non-Wraith creature dies, you may pay its converted mana cost as colorless mana. If you do, exile it and create a token that is a copy of that creature, it's a Wraith in addition to its other types.
"At last, I can exact my vengeance"