Is Ascendant Packleader legal in Standard, Modern, and Commander?

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

Ascendant Packleader

Q: What type of card is Ascendant Packleader?

Ascendant Packleader is a Creature — Wolf. Its oracle text reads: "This creature enters with a +1/+1 counter on it if you control a permanent with mana value 4 or greater. Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."