Helm of the Ghastlord is a common Enchantment — Aura card from Shadowmoor (SHM), collector number 166. Current market price: $11.29 (foil $96.32), TCGplayer market prices via Scryfall.
Enchant creature As long as enchanted creature is blue, it gets +1/+1 and has "Whenever this creature deals damage to an opponent, draw a card." As long as enchanted creature is black, it gets +1/+1 and has "Whenever this creature deals damage to an opponent, that player discards a card."