Is Sigardian Paladin legal in Standard, Modern, and Commander?

Sigardian Paladin is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Sigardian Paladin

Q: What type of card is Sigardian Paladin?

Sigardian Paladin is a Creature — Human Knight. Its oracle text reads: "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. Power/Toughness: 4/4"