Tempered Veteran is a uncommon Creature — Human Knight card from Core Set 2021 (M21), collector number 41. Current market price: $0.20 (foil $0.21), TCGplayer market prices via Scryfall.
{W}, {T}: Put a +1/+1 counter on target creature with a +1/+1 counter on it. {4}{W}{W}, {T}: Put a +1/+1 counter on target creature.