Split regeneration

Enchant creature
Enchanted creature have:{c}{c}:"exile this creture,
than put it back on the battlefield with this aura
attached to it and X -1/-1 counters, where X is half
of its power rounded up and create a colorless creature token that's a copy of that creature, but
with half of thats creature power and have:"{c}:sacrifice this creature" use this ability only if
you don't control other creatures with the name
of the enchanted creature