Is Mimeoplasm, Revered One legal in Standard, Modern, and Commander?

Mimeoplasm, Revered One is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Mimeoplasm, Revered One

Q: What type of card is Mimeoplasm, Revered One?

Mimeoplasm, Revered One is a Legendary Creature — Ooze. Its oracle text reads: "As Mimeoplasm enters, exile up to X creature cards from your graveyard. It enters with three +1/+1 counters on it for each creature card exiled this way. {2}: Mimeoplasm becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability. Power/Toughness: 0/0"

Legendary Creature — Ooze

As Mimeoplasm enters, exile up to X creature cards from your graveyard. It enters with three +1/+1 counters on it for each creature card exiled this way.

: Mimeoplasm becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability.