Pest Rescuer

If you gain an amount of life "for each" of something or "equal to the number" of something, that life is gained as one event and the last ability of Pest Rescuer applies only once.

If you control two Pest Rescuers and you would gain life, you gain that much life plus 2. A third Pest Rescuer has you gain that much life plus 3, and so on.

Each creature with lifelink dealing combat damage causes a separate life-gaining event. For example, if two creatures you control with lifelink deal combat damage at the same time, Pest Rescuer's last ability will apply twice. However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, planeswalkers, and/or battles at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will apply only once.