Is Scholar of New Horizons legal in Standard, Modern, and Commander?

Scholar of New Horizons is legal in: Legacy, Vintage, Commander.

Scholar of New Horizons

Q: What type of card is Scholar of New Horizons?

Scholar of New Horizons is a Creature — Human Scout. Its oracle text reads: "This creature enters with a +1/+1 counter on it. {T}, Remove a counter from a permanent you control: Search your library for a Plains card and reveal it. If an opponent controls more lands than you, you may put that card onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand. Then shuffle. Power/Toughness: 1/1"

Creature — Human Scout

This creature enters with a +1/+1 counter on it.

, Remove a counter from a permanent you control: Search your library for a Plains card and reveal it. If an opponent controls more lands than you, you may put that card onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand. Then shuffle.