Xelph, who has a Chat over Tea

{t}: The next time a creature enters the battlefield, tap it and Xelph. They don't untap
during their controllers untap steps.
At the beginning of each player's upkeep, they
put a tea counter on each creature they control
that is tapped by Xelph.
{ut}, Untap each creature tapped by Xelph: The untapped creature's controller creates a Clue for
each tea counter on it.