Is Hamza, Guardian of Arashin legal in Standard, Modern, and Commander?

Hamza, Guardian of Arashin is legal in: Legacy, Vintage, Commander, Historic.

Hamza, Guardian of Arashin

Q: What type of card is Hamza, Guardian of Arashin?

Hamza, Guardian of Arashin is a Legendary Creature — Elephant Warrior. Its oracle text reads: "This spell costs {1} less to cast for each creature you control with a +1/+1 counter on it. Creature spells you cast cost {1} less to cast for each creature you control with a +1/+1 counter on it. *"I stand with every member of my clan, and they stand with me."* Power/Toughness: 5/5"