Rexar, The Unyielding

Haste
{t}:Rexar does 1 damage to target creature you
don't control. When that creature dies this turn,
you get an experience counter.
{b/g}{b/g}: If you have atleast 5 experience counters. Sacrifice Rexar, The Unyielding and return
him to the battlefield flipped as Rexar,The
Undying under his owners control.