Pest Mutation

X cannot be zero.
As an additional cost to cast this spell,
sacrifice X pest creature tokens.
Pest Mutation enters the battlefield with X
+1/+1 counters. If damage would be dealt to Pest Mutation while it has a +1/+1 counter on it,
prevent that damage, remove that many +1/+1
counters and create that many 1/1
black and green pest creature tokens with
"When this creature dies, you gain 1 life"