Is Ancestral Knowledge legal in Standard, Modern, and Commander?

Ancestral Knowledge is legal in: Legacy, Vintage, Commander.

Ancestral Knowledge

Q: What type of card is Ancestral Knowledge?

Ancestral Knowledge is an Enchantment. Its oracle text reads: "Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When this enchantment enters, look at the top ten cards of your library, then exile any number of them and put the rest back on top of your library in any order. When this enchantment leaves the battlefield, shuffle your library."

Enchantment

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

When this enchantment enters, look at the top ten cards of your library, then exile any number of them and put the rest back on top of your library in any order.

When this enchantment leaves the battlefield, shuffle your library.

Set Weatherlight

Rarity Rare

Mana Value 2

Artist Colin MacNeil

Collector # 32

Scryfall