Cyclical Rejuvenation

Cyclical Rejuvination comes into play with
10 rebirth counters on it. During each player's
upkeep, remove a rebirth counter from Cyclical Rejuvination. If there are no rebirth counters on Cyclical Rejuvination, sacrifice it.
{4}{g}{g}, sacrifice 2 lands you control: Return
your current life total to your starting life total.
Use this ability only if you have an odd number
of rebirth counters on Cyclical Rejuvination.