When you compose a decklist for a Legacy tournament, make sure you write his full name correctly, because recently we have had a glorious return of this character in the shape of Teferi, Temporal Archmage Teferi has three abilities
One obvious, if disheartening, use is to abuse another person's lack of knowledge regarding TCGPlayer and take advantage of them
Rhys the Redeemed If youre looking for an explosive Commander to lead your Elf army, then Rhys, the Redeemed is an excellent option
The combo we're assembling is Niv-Mizzet, Parun + either Curiosity / Tandem Lookout / Ophidian Eye
They then resolve like this: Exile the top card of your library until you exile a non-land spell with a lower mana cost than the original card with Cascade
For just three mana and sacrificing an artifact, Tinker lets you tutor any artifact in your deck directly onto the battlefield, which allows for things like a Turn 1 Blightsteel Colossus or God-Pharaoh's Statue or Bolas's Citadel, all of which are pretty close to unbeatable