Is Towering Gibbon legal in Standard, Modern, and Commander?

Towering Gibbon is legal in: Legacy, Vintage, Commander.

Towering Gibbon

Q: What type of card is Towering Gibbon?

Towering Gibbon is a Creature — Ape. Its oracle text reads: "Reach Towering Gibbon's power is equal to the greatest mana value among creatures you control. *"Don't worry, folks. We're perfectly safe here. That's a banana processing plant."* Power/Toughness: */4"