Is The First Sliver legal in Standard, Modern, and Commander?

The First Sliver is legal in: Modern, Legacy, Vintage, Commander, Historic.

The First Sliver

Q: What type of card is The First Sliver?

The First Sliver is a Legendary Creature — Sliver. Its oracle text reads: "Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Sliver spells you cast have cascade."

Legendary Creature — Sliver

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Sliver spells you cast have cascade.

Set Modern Horizons

Rarity Mythic Rare

Mana Value 5

Artist Svetlin Velinov

Collector # 200

Scryfall Gatherer