Teferi, Temporal Archmage {4}{U}{U}
Legendary Planeswalker — Teferi
BlueCommander: legal
Identity
Blue
EDHREC rank
#3,964
Cheapest printing
US$1.28
TCGplayer
Printings
4
+1: Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.
−1: Untap up to four target permanents.
−10: You get an emblem with "You may activate loyalty abilities of planeswalkers you control on any player's turn any time you could cast an instant."
Teferi, Temporal Archmage can be your commander.
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.