Is Lonis, Cryptozoologist legal in Standard, Modern, and Commander?

Lonis, Cryptozoologist is legal in: Modern, Legacy, Vintage, Commander, Historic.

Lonis, Cryptozoologist

Q: What type of card is Lonis, Cryptozoologist?

Lonis, Cryptozoologist is a Legendary Creature — Snake Elf Scout. Its oracle text reads: "Whenever another nontoken creature you control enters, investigate. {T}, Sacrifice X Clues: Target opponent reveals the top X cards of their library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield under your control. That player puts the rest on the bottom of their library in a random order. Power/Toughness: 1/2"

Legendary Creature — Snake Elf Scout

Whenever another nontoken creature you control enters, investigate.

, Sacrifice X Clues: Target opponent reveals the top X cards of their library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield under your control. That player puts the rest on the bottom of their library in a random order.