Is Floodgate legal in Standard, Modern, and Commander?

Floodgate is legal in: Legacy, Vintage, Commander.

Floodgate

Q: What type of card is Floodgate?

Floodgate is a Creature — Wall. Its oracle text reads: "DefenderWhen Floodgate has flying, sacrifice it.When Floodgate leaves the battlefield, it deals damage to each nonblue creature without flying equal to half the number of Islands you control, rounded down."

Creature — Wall

Defender<br>When Floodgate has flying, sacrifice it.<br>When Floodgate leaves the battlefield, it deals damage to each nonblue creature without flying equal to half the number of Islands you control, rounded down.

Set Mirage

Rarity Uncommon

Artist Jeff Miracola