Elixir Omega Healer

You may cast Elixir, Omega Healer from your graveyard by paying its mana cost. At the beginning of your upkeep, you may return target creature card from your graveyard to the battlefield. Whenever a creature enters the battlefield under your control, if it wasn’t cast, you gain 4 life.{flavor}“Life isn’t something I give. It’s something I refuse to let go.”