Teferi, Temporal Archmage
Legendary Planeswalker — Teferi
+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.
If you control Teferi’s emblem, the rule that says you can activate a loyalty ability only if none of that permanent’s loyalty abilities have been activated that turn still applies. In other words, you could activate a planeswalker’s loyalty ability once on your turn and once on each of your opponents’ turns.