Is Chorus of the Conclave legal in Standard, Modern, and Commander?

Chorus of the Conclave is legal in: Modern, Legacy, Vintage, Commander.

Chorus of the Conclave

Q: What type of card is Chorus of the Conclave?

Chorus of the Conclave is a Legendary Creature — Dryad. Its oracle text reads: "Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) As an additional cost to cast creature spells, you may pay any amount of mana. If you do, that creature enters with that many additional +1/+1 counters on it."

Legendary Creature — Dryad

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

As an additional cost to cast creature spells, you may pay any amount of mana. If you do, that creature enters with that many additional +1/+1 counters on it.

Set Commander 2011

Rarity Rare

Mana Value 8

Artist Brian Despain

Collector # 189

Scryfall Gatherer