Avatar of Woe is a special Creature — Avatar card from Time Spiral Timeshifted (TSB), collector number 37. Current market price: $5.11 (foil $32.58), TCGplayer market prices via Scryfall.
If there are ten or more creature cards total in all graveyards, this spell costs {6} less to cast. Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) {T}: Destroy target creature. It can't be regenerated.