Chosen Undead

Whenever a creature you don't control dies
you get an experience counter.
Whenever Chosen Undead leaves the battlefield,
remove all experience counters you own.
Chosen Undead Gets +1/+1 for each experience
counter.
"To Be Alive... To Walk This Earth...
That's The Real Curse Right There."
- Crestfallen Saulden (DS2)