Temnospondyli

Whenever you cast an instant or sorcery spell,
if Temnospondyli has less than two +1/+1 counters on it, put a number of +1/+1 counters
on Temnospondyli equal to the difference.

At the beginning of your upkeep, remove a
+1/+1 counter from Temnospondyli. If a
counter is removed this way, gain 1 life.