Nahiri, Forged in Fury is a mythic Legendary Creature — Kor Artificer card from March of the Machine: The Aftermath (MAT), collector number 36. Current market price: $7.94 (foil $7.99), TCGplayer market prices via Scryfall.
Affinity for Equipment (This spell costs {1} less to cast for each Equipment you control.) Whenever an equipped creature you control attacks, exile the top card of your library. You may play that card this turn. You may cast Equipment spells this way without paying their mana costs.