Yahenni, Penultimate Host

If Yahenni, Penultimate Host is your commander,
you start the game with an emblem with "At the
beginning of your end step, exile the top four cards
of your library and put dermis counters on them."

Ward—Sacrifice a legendary permanent.

{w}{u}{b}{r}{g}, {t}: You may play a card you own in
exile with a dermis counter on it without paying its
mana cost.