Is Opal Palace legal in Standard, Modern, and Commander?

Opal Palace is legal in: Legacy, Vintage, Commander, Pauper.

Opal Palace

Q: What type of card is Opal Palace?

Opal Palace is a Land. Its oracle text reads: "{T}: Add {C}. {1}, {T}: Add one mana of any color in your commander's color identity. If you spend this mana to cast your commander, it enters with a number of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game."

Land

: Add .

, : Add one mana of any color in your commander's color identity. If you spend this mana to cast your commander, it enters with a number of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game.