Is Rampant Rejuvenator legal in Standard, Modern, and Commander?

Rampant Rejuvenator is legal in: Legacy, Vintage, Commander.

Rampant Rejuvenator

Q: What type of card is Rampant Rejuvenator?

Rampant Rejuvenator is a Creature — Plant Hydra. Its oracle text reads: "This creature enters with two +1/+1 counters on it. When this creature dies, search your library for up to X basic land cards, where X is this creature's power, put them onto the battlefield, then shuffle."

Creature — Plant Hydra

This creature enters with two +1/+1 counters on it.

When this creature dies, search your library for up to X basic land cards, where X is this creature's power, put them onto the battlefield, then shuffle.

Set Neon Dynasty Commander

Rarity Rare

Mana Value 4

Artist Andrey Kuzinskiy

Collector # 28

Scryfall Gatherer