Squire's Devotion is a common Enchantment — Aura card from Rivals of Ixalan (RIX), collector number 25. Current market price: $0.22 (foil $0.35), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+1 and has lifelink. When this Aura enters, create a 1/1 white Vampire creature token with lifelink.