Primal Whisperer is a rare Creature — Elf Soldier card from Legions (LGN), collector number 135. Current market price: $0.85 (foil $8.03), TCGplayer market prices via Scryfall.
This creature gets +2/+2 for each face-down creature on the battlefield. Morph {3}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)