Hizalmot, Locked in Time

At the beginning of your upkeep, if Hizalmot, Locked in Time is in exile and you've taken an extra turn this game, each opponent draws a card and untaps up to one nonland permanent they control.
Whenever you cast a spell that would cause you to take an extra turn, you may exile Hizalmot. If you do, copy that spell, then return it to its owner's hand. If that spell had targets, you may ch