Pious Kitsune is a common Creature — Fox Cleric card from Champions of Kamigawa (CHK), collector number 38. Current market price: $0.10 (foil $1.16), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, put a devotion counter on this creature. Then if a creature named Eight-and-a-Half-Tails is on the battlefield, you gain 1 life for each devotion counter on this creature. {T}, Remove a devotion counter from this creature: You gain 1 life.