Recycle that graveyard. A few creatures that grow with every death, and little creatures with ETB effects. A war of attrition for my opponents.
color identity
Golgari : Black and Green
commander effects
Whenever another creature you control dies, you get an experience counter.
At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.