Pentarch Ward is a common Enchantment — Aura card from The List (PLST), collector number IMA-27. Current market price: $0.34, TCGplayer market prices via Scryfall.
Enchant creature As this Aura enters, choose a color. When this Aura enters, draw a card. Enchanted creature has protection from the chosen color. This effect doesn't remove this Aura.