Is Nantuko Monastery legal in Standard, Modern, and Commander?

Nantuko Monastery is legal in: Legacy, Vintage, Commander.

Nantuko Monastery

Q: What type of card is Nantuko Monastery?

Nantuko Monastery is a Land. Its oracle text reads: "{T}: Add {C}. Threshold — {G}{W}: This land becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It's still a land. Activate only if there are seven or more cards in your graveyard."

Land

: Add .

Threshold — : This land becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It's still a land. Activate only if there are seven or more cards in your graveyard.