Navigate the Eternities

At the beginning of your upkeep, if this turn is not an extra turn and you have 25 or more life than your starting life total, take an extra turn after this one. If you don't, you gain 1 life.
"During the 250th rotation of the Primordial Sundial, the gates to eternity opened up to the mortals, a new frontier to be explored."
-Chapter 4, page 250 of The Guide to the Eternal.