Is Coral Colony legal in Standard, Modern, and Commander?

Coral Colony is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Coral Colony

Q: What type of card is Coral Colony?

Coral Colony is a Creature — Wall. Its oracle text reads: "Defender {1}{U}, {T}: Target player mills X cards, where X is the number of creatures you control with defender. (To mill a card, a player puts the top card of their library into their graveyard.)"

Creature — Wall

Defender

, : Target player mills X cards, where X is the number of creatures you control with defender. (To mill a card, a player puts the top card of their library into their graveyard.)