Is First Day of Class legal in Standard, Modern, and Commander?

First Day of Class is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

First Day of Class

Q: What type of card is First Day of Class?

First Day of Class is an Instant. Its oracle text reads: "Whenever a creature you control enters this turn, put a +1/+1 counter on it and it gains haste until end of turn. Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)"