Boneknitter is a uncommon Creature — Zombie Cleric card from Onslaught (ONS), collector number 128. Current market price: $0.23 (foil $1.16), TCGplayer market prices via Scryfall.
{1}{B}: Regenerate target Zombie. Morph {2}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)