Stasis Vault

At the beginning of each end step, each player's life total becomes equal to their starting life total, each player returns to the battlefield each permanent that was put into a graveyard from play, or into exile from play, under it's owner's control, then each player untaps all lands they control.
"No matter what I do, I cannot escape it. Everything reverts to the way it was before I can leave. Every change I make, every path I walk, all end up taking me to the same point in time!"