Naga Sadow, Sith Legend

Whenever a creature dies, put an experience
counter on Naga Sadow, sith Legend.
At the beginning of your end step, you may
search your graveyard for a creature card. If its
converted mana cost is less than or equal to
the amount of experience counters on Naga
Sadow, Sith legend , put it onto the battlefield
tapped.