Sinew Dancer is a common Creature — Phyrexian Soldier card from Phyrexia: All Will Be One (ONE), collector number 286. Current market price: $0.14 (foil $0.14), TCGplayer market prices via Scryfall.
{3}{W}, {T}: Tap target creature. Corrupted — {W}, {T}: Tap target creature. Activate only if an opponent has three or more poison counters.