Is Keepsake Gorgon legal in Standard, Modern, and Commander?

Keepsake Gorgon is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Keepsake Gorgon

Q: What type of card is Keepsake Gorgon?

Keepsake Gorgon is a Creature — Gorgon. Its oracle text reads: "Deathtouch{5}{B}{B}: Monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.)When Keepsake Gorgon becomes monstrous, destroy target non-Gorgon creature an opponent controls."

Creature — Gorgon

Deathtouch<br>: Monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.)<br>When Keepsake Gorgon becomes monstrous, destroy target non-Gorgon creature an opponent controls.