Seshiva, Exhaustion Eternal

Lifelink
Cumulative upkeep—Pay 1 life. (At the beginning
of your upkeep, put an age counter on this permanent,
then sacrifice it unless you pay its upkeep cost for
each age counter on it.)
Seshiva gets +1/+1 for each age counter on it.
When Seshiva dies, if it had four or more age
counters on it, return it to your hand.