Knight Exemplar is a rare Creature — Human Knight card from Secret Lair Drop (SLD), collector number 707. Current market price: $4.68 (foil $5.30), TCGplayer market prices via Scryfall.
First strike (This creature deals combat damage before creatures without first strike.) Other Knight creatures you control get +1/+1 and have indestructible. (Damage and effects that say "destroy" don't destroy them.)