Is Scarlet Spider, Kaine legal in Standard, Modern, and Commander?

Scarlet Spider, Kaine is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Scarlet Spider, Kaine

Q: What type of card is Scarlet Spider, Kaine?

Scarlet Spider, Kaine is a Legendary Creature — Spider Human Hero. Its oracle text reads: "Menace (This creature can't be blocked except by two or more creatures.) When Scarlet Spider enters, you may discard a card. If you do, put a +1/+1 counter on him. Mayhem {B/R} (You may cast this card from your graveyard for {B/R} if you discarded it this turn. Timing rules still apply.) *Those who cross Kaine are forever marked.* Power/Toughness: 2/1"