Ajani's Sunstriker

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

Oreskos Sun Guide

Inspired — Whenever Oreskos Sun Guide becomes untapped, you gain 2 life.

Vigilance, lifelink
At the beginning of your upkeep, if you have 40 or more life, you win the game.

Other Cats you control get +1/+1 and have lifelink.
When Regal Caracal enters, create two 1/1 white Cat creature tokens with lifelink.

Whenever you gain life, put a +1/+1 counter on Ajani's Pridemate.

Lifelink
When Charmed Stray enters, put a +1/+1 counter on each other creature you control named Charmed Stray.

When this creature enters, roll a six-sided die. You gain life equal to the result.