Sigardian Paladin is a uncommon Creature — Human Knight card from Innistrad: Double Feature (DBL), collector number 514. Current market price: $0.23 (foil $0.36), TCGplayer market prices via Scryfall.
As long as you've put one or more +1/+1 counters on a creature this turn, this creature has trample and lifelink. {1}{G}{W}: Target creature you control with a +1/+1 counter on it gains trample and lifelink until end of turn.