Too Much Lubz

During each player's upkeep, that player gains
life equal to the number of creatures in play.
If the amount of life gained this way exceeds 7,
that player must reveal from the top of their
library a number of cards equal to the life gained
in excess of 7 and remove them from the game.
At the end of that player's turn, that player may
pay X life to return X cards to their library that
were removed in this manner. Shuffle those cards
into that player's library.