Is Four Knocks legal in Standard, Modern, and Commander?

Four Knocks is legal in: Legacy, Vintage, Commander.

Four Knocks

Q: What type of card is Four Knocks?

Four Knocks is an Enchantment. Its oracle text reads: "Vanishing 4 (This enchantment enters with four time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.) At the beginning of your first main phase, draw a card."

Enchantment

Vanishing 4 (This enchantment enters with four time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

At the beginning of your first main phase, draw a card.

Set Doctor Who

Rarity Rare

Mana Value 3

Artist Darren Tan

Collector # 20

Scryfall Gatherer