Is Nether Traitor legal in Standard, Modern, and Commander?

Nether Traitor is legal in: Modern, Legacy, Vintage, Commander.

Nether Traitor

Q: What type of card is Nether Traitor?

Nether Traitor is a Creature — Spirit. Its oracle text reads: "Haste Shadow (This creature can block or be blocked by only creatures with shadow.) Whenever another creature is put into your graveyard from the battlefield, you may pay {B}. If you do, return this card from your graveyard to the battlefield."

Creature — Spirit

Haste

Shadow (This creature can block or be blocked by only creatures with shadow.)

Whenever another creature is put into your graveyard from the battlefield, you may pay . If you do, return this card from your graveyard to the battlefield.

Set Time Spiral Remastered

Rarity Rare

Mana Value 2

Artist Vance Kovacs

Collector # 127

Scryfall Gatherer