Iden, Apprentice Stitcher

Changeling (This card is every creature type)
Hexproof
{1}{u/b}, Pay 2 life: Each player puts the top two
cards of their library into their graveyard. If this
is the third time this ability has resolved this turn,
exile Iden, Apprentice Stitcher, then return them
to the battlefield transformed under your control.