Is Soulflayer legal in Standard, Modern, and Commander?

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

Soulflayer

Q: What type of card is Soulflayer?

Soulflayer is a Creature — Demon. Its oracle text reads: "Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)If a creature card with flying was exiled with Soulflayer's delve ability, Soulflayer has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance."

Creature — Demon

Delve (Each card you exile from your graveyard while casting this spell pays for .)<br>If a creature card with flying was exiled with Soulflayer's delve ability, Soulflayer has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance.