Is Viashino Slaughtermaster legal in Standard, Modern, and Commander?

Viashino Slaughtermaster is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Viashino Slaughtermaster

Q: What type of card is Viashino Slaughtermaster?

Viashino Slaughtermaster is a Creature — Lizard Warrior. Its oracle text reads: "Double strike {B}{G}: This creature gets +1/+1 until end of turn. Activate only once each turn. *"I'll fight two at once, and then lick their guts from my blades."* Power/Toughness: 1/1"