Mesa Unicorn

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

Good-Fortune Unicorn

Whenever another creature you control enters, put a +1/+1 counter on that creature.

All creatures able to block Prized Unicorn do so.

Sacrifice Ronom Unicorn: Destroy target enchantment.

Whenever you gain life, put a +1/+1 counter on Celestial Unicorn.

Whenever Inspiring Unicorn attacks, creatures you control get +1/+1 until end of turn.