Is Kathari Remnant legal in Standard, Modern, and Commander?

Kathari Remnant is legal in: Modern, Legacy, Vintage, Commander.

Kathari Remnant

Q: What type of card is Kathari Remnant?

Kathari Remnant is a Creature — Bird Skeleton. Its oracle text reads: "Flying {B}: Regenerate this creature. 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.)"

Creature — Bird Skeleton

Flying

: Regenerate this creature.

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.)

Set Planechase Anthology

Rarity Uncommon

Mana Value 4

Artist Anthony S. Waters

Collector # 98

Scryfall Gatherer