Is Seven-Tail Mentor legal in Standard, Modern, and Commander?

Seven-Tail Mentor is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Seven-Tail Mentor

Q: What type of card is Seven-Tail Mentor?

Seven-Tail Mentor is a Creature — Fox Samurai. Its oracle text reads: "When this creature enters or dies, put a +1/+1 counter on target creature or Vehicle you control. *"I have taught you all I can. Take this blade and rise as my equal."* Power/Toughness: 2/3"