Knight Exemplar is a rare Creature — Human Knight card from Magic 2011 (M11), collector number 20. Current market price: $4.71 (foil $10.95), 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.)