Soul Warden

Whenever another creature enters, you gain 1 life.

Healer of the Pride

Whenever another creature you control enters, you gain 2 life.

Ajani's Welcome

Whenever a creature you control enters, you gain 1 life.

Thrumming Stone

Spells you cast have ripple 4. (Whenever you cast a spell, you may reveal the top four cards of your library. You may cast spells with the same name as that spell from among the revealed cards without paying their mana costs. Put the rest on the bottom of your library.)

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Hare Apparent

When this creature enters, create a number of 1/1 white Rabbit creature tokens equal to the number of other creatures you control named Hare Apparent.
A deck can have any number of cards named Hare Apparent.