Whispersteel Dagger is a rare Artifact — Equipment card from Zendikar Rising Commander (ZNC), collector number 5. Current market price: $0.32, TCGplayer market prices via Scryfall.
Equipped creature gets +2/+0. Whenever equipped creature deals combat damage to a player, you may cast a creature spell from that player's graveyard this turn, and you may spend mana as though it were mana of any color to cast that spell. Equip {3}