Is Saltskitter legal in Standard, Modern, and Commander?

Saltskitter is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Saltskitter

Q: What type of card is Saltskitter?

Saltskitter is a Creature — Wurm. Its oracle text reads: "Whenever another creature enters, exile this creature. Return this creature to the battlefield under its owner's control at the beginning of the next end step."

Creature — Wurm

Whenever another creature enters, exile this creature. Return this creature to the battlefield under its owner's control at the beginning of the next end step.

Set Future Sight

Rarity Common

Mana Value 4

Artist Chippy

Collector # 14

Scryfall Gatherer