Knight of Meadowgrain

First strike
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Nykthos Paragon

Whenever you gain life, you may put that many +1/+1 counters on each creature you control. Do this only once each turn.

Flying, first strike, lifelink, protection from Demons and from Dragons

Whenever you gain life, put a +1/+1 counter on this creature.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)