Harbinger of Spring is a common Creature — Spirit card from Betrayers of Kamigawa (BOK), collector number 128. Current market price: $0.07 (foil $0.47), TCGplayer market prices via Scryfall.
Protection from non-Spirit creatures Soulshift 4 (When this creature dies, you may return target Spirit card with mana value 4 or less from your graveyard to your hand.)