Eternal Growth

Unknown, Trample
Eternal Growth enters the battlefield with 19
-1/-1 counters on it. Whenever another creature
enters the battlefield, you may move a -1/-1
counter from Eternal Growth to that creature,
if you do, you gain 1 life.
{1}: Remove a -1/-1 counter from a creature they control put there by Eternal growth: Gain 1 life.
(Any player may activate this ability only on your
turn.)