Is Timesifter legal in Standard, Modern, and Commander?

Timesifter is legal in: Modern, Legacy, Vintage, Commander.

Timesifter

Q: What type of card is Timesifter?

Timesifter is an Artifact. Its oracle text reads: "At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the greatest mana value takes an extra turn after this one. If two or more players' cards are tied for greatest, the tied players repeat this process until the tie is broken."

Artifact

At the beginning of each upkeep, each player exiles the top card of their library. The player who exiled the card with the greatest mana value takes an extra turn after this one. If two or more players' cards are tied for greatest, the tied players repeat this process until the tie is broken.

Set Mirrodin

Rarity Rare

Mana Value 5

Artist Dany Orizio

Collector # 262

Scryfall Gatherer