Project Zac

Project Zac enters the battlefield with X +1/+1 counters on it.
When Project Zac dies, create a 0/0 blob creature
token with a +1/+1 counter on it that has "At the
end of your turn put a +1/+1 counter on this
creature, if this creature has four or more +1/+1 counters on it, at the end of your turn return
Project Zac to the battlefield with four +1/+1
counters on it".