Chronomancer of Eternities

Flash
At the beginning of your upkeep, you may choose one:
•Draw two cards, then discard a card.
•Return target nonland permanent to its owner's hand.
•Target opponent mills the top 3 cards of their library.
Temporal shift {u}{b}{2}: Take an extra turn after this one. Activate this ability only if you've cast two or more spells this turn, and only once per game.
Whenever Chronomancer of Eternities becomes the target of a spell or ability, you may pay {1}{u}{b}. If you do, counter that