Is Final Fortune legal in Standard, Modern, and Commander?

Final Fortune is legal in: Legacy, Vintage, Commander.

What type of card is Final Fortune?

Final Fortune is an Instant. Its oracle text reads: "Take an extra turn after this one. At the beginning of that turn's end step, you lose the game."

Instant

Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.

Set Mirage

Rarity Rare

Artist D. Alexander Gregory

Instant Commander Legacy Vintage