Tallowisp is a uncommon Creature — Spirit card from Betrayers of Kamigawa (BOK), collector number 25. Current market price: $0.34 (foil $5.21), TCGplayer market prices via Scryfall.
Whenever you cast a Spirit or Arcane spell, you may search your library for an Aura card with enchant creature, reveal it, put it into your hand, then shuffle.