Temporal Labyrinth

At the beginning of your upkeep put an abstraction counter on Temporal Labyrinth.
Whenever Temporal Labyrinth has 7 or more abstraction counters on it, remove all abstraction counters from it and set each player's life to 20, remove all counters from all players, shuffle each player's hand, graveyard, exile, and all permanents other than Temporal Labyrinth into their owner's library, then each player draws
7 cards.