Keyword: Lifelink

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

Lifelink
Voracious Hatchling enters the battlefield with four -1/-1 counters on it.
Whenever you cast a white spell, remove a -1/-1 counter from Voracious Hatchling.
Whenever you cast a black spell, remove a -1/-1 counter from Voracious Hatchling.

Flying, lifelink
Divinity of Pride gets +4/+4 as long as you have 25 or more life.

Lifelink, protection from converted mana cost 3 or greater

Changeling (This card is every creature type.)
Champion a creature (When this enters the battlefield, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Lifelink
, , Sacrifice another creature: Brion Stoutarm deals damage equal to the sacrificed creature’s power to target player or planeswalker.

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

Lifelink, protection from converted mana cost 3 or greater