Strength of Isolation is a uncommon Enchantment — Aura card from Torment (TOR), collector number 17. Current market price: $0.25 (foil $0.62), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+2 and has protection from black. Madness {W} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)