Rochelle, Silent Watcher

Flying, Lifelink
Whenever you cast an Arcane spell or a Spirit creature enters the battlefield under your control,
gain 1 life and target opponent looses 1 life.
{4}{w/b}{t}: Exile target Arcane or Spirit card from
your graveyard, you may cast it without paying
its mana cost this turn. Creatures exiled this way
enter the battlefield as token copies.