Jwar's Risen Headstones

Whenever a creature dies, exile it and create
an X/X black skeleton creature token copy of
that creature where X is the converted mana
cost of the exiled card. This creature token
has "{b}: regenerate" and fading 2. (This creature
enters the battlefield with two fade counters on it. At
the beginning of your upkeep, remove a fade
counter from it. If you can not, sacrifice it.)