Is Deekah, Fractal Theorist legal in Standard, Modern, and Commander?

Deekah, Fractal Theorist is legal in: Legacy, Vintage, Commander.

Deekah, Fractal Theorist

Q: What type of card is Deekah, Fractal Theorist?

Deekah, Fractal Theorist is a Legendary Creature — Human Wizard. Its oracle text reads: "Magecraft — Whenever you cast or copy an instant or sorcery spell, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is that spell's mana value. {3}{U}: Target creature token can't be blocked this turn."

Legendary Creature — Human Wizard

Magecraft — Whenever you cast or copy an instant or sorcery spell, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is that spell's mana value.

: Target creature token can't be blocked this turn.