Spiral into Solitude is a common Enchantment — Aura card from Lorwyn Eclipsed (ECL), collector number 36. Current market price: $0.16 (foil $0.17), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature can't attack or block. {1}{W}, Blight 1, Sacrifice this Aura: Exile enchanted creature. (To blight 1, put a -1/-1 counter on a creature you control.)