Krovikan Plague is a uncommon Enchantment — Aura card from Alliances (ALL), collector number 54. Current market price: $0.27, TCGplayer market prices via Scryfall.
Enchant non-Wall creature you control When this Aura enters, draw a card at the beginning of the next turn's upkeep. Tap enchanted creature: This Aura deals 1 damage to any target. Put a -0/-1 counter on enchanted creature. Activate only if enchanted creature is untapped.