Bjorna, Nightfall Alchemist is a rare Legendary Creature — Human card from Secret Lair Drop (SLD), collector number 344. Current market price: $5.05 (foil $3.70), TCGplayer market prices via Scryfall.
{T}, Sacrifice an artifact: Bjorna, Nightfall Alchemist deals 1 damage to target creature. Goad that creature. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.) Partner—Friends forever (You can have two commanders if both have this ability.)