Is Rat King, Verminister legal in Standard, Modern, and Commander?

Rat King, Verminister is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Rat King, Verminister

Q: What type of card is Rat King, Verminister?

Rat King, Verminister is a Legendary Creature — Rat Avatar. Its oracle text reads: "Disappear — At the beginning of your end step, if a permanent left the battlefield under your control this turn, create a 1/1 black Rat creature token and put a +1/+1 counter on Rat King. {T}, Sacrifice three Rats: Return target creature card and all other cards with the same name as that card from your graveyard to the battlefield tapped."

Legendary Creature — Rat Avatar

Disappear — At the beginning of your end step, if a permanent left the battlefield under your control this turn, create a 1/1 black Rat creature token and put a +1/+1 counter on Rat King.

, Sacrifice three Rats: Return target creature card and all other cards with the same name as that card from your graveyard to the battlefield tapped.