Iron-Craw Crusher is a uncommon Artifact Creature — Wurm card from The Brothers' War (BRO), collector number 200. Current market price: $0.19 (foil $0.28), TCGplayer market prices via Scryfall.
Prototype {2}{G}{G} — 2/5 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power.