Immortality

[Wally]

{Kitchen Finks} sacrifice for {viscera seer} comes back with a -1/-1 counter {ivylane denizen is out green creature enters battlefield gets +1/+1 counter. The two counters counter each other out and cease to exist. Sacrifice again, persist again repeat until end of time

Ahh yes nicely done. I missed that as I wasn't thinking of just green creatures. The only other green persist creature I put up above is the woodfall primus. It severely limits the combo pieces, but it's probably legal in more formats.