Aethia, Warrior of Peace

+1: Create a 3/3, green centaur creature token, you gain three life. Add a loyalty counter to Aethia equal to the number of creatures you control.
-6: Create an emblem that says, "Whenever a creature enters the battlefield under your control, you gain life equal to its toughness."
-8: Create an emblem that says, "At the beginning of your upkeep, if you have life total higher than 20, return Aethia to the your hand."