Warden of the Grove (TDM-166)
[Tarkir: Dragonstorm]

At the beginning of your end step, put a +1/+1 counter on this creature.

Whenever another nontoken creature you control enters, it endures X, where X is the number of counters on this creature. (Put X +1/+1 counters on the creature that entered or create an XIX white Spirit creature token.)