Nantuko Calmer is a common Creature — Insect Druid card from Torment (TOR), collector number 132. Current market price: $0.12 (foil $0.61), TCGplayer market prices via Scryfall.
{G}, {T}, Sacrifice this creature: Destroy target enchantment. Threshold — This creature gets +1/+1 as long as there are seven or more cards in your graveyard.