Oroboros of Eternal Life

Defender.
{3}{g}{g}, {t}: All players retrieve X cards from their
graveyard, then reshuffle: for every creature or land
retrieved, that Player loses a life but gains {2}: X is equal to lands and creatures on the field.

When destroyed or sacrificed, revert it back into
Ankh of Eternity, +0/+3 counter upon its next transformation, stacks. User gains (6+R) life: R is equal to the number of times it has reverted.