Light of Promise

Enchant creature
Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature."

Ajani's Pridemate

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

Whenever another creature enters, you gain 1 life.

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

First strike, vigilance, lifelink
Aura and Equipment spells you cast cost {1} less to cast.

Whenever you gain life, you may pay {2}. If you do, draw a card.
{3}{W}: Create a 1/1 white Soldier creature token with lifelink.

Choose a color. White creatures you control gain protection from the chosen color until end of turn.

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

Whenever you gain life, you may pay {X}, where X is less than or equal to the amount of life you gained. If you do, draw X cards.

First strike, lifelink
At the beginning of the end step, if you gained 3 or more life this turn, transform Lone Rider.

When this enchantment enters, exile target nonland permanent an opponent controls until this enchantment leaves the battlefield.