Mark of the Passing

Surveil 4. For each player, eternalize up to one
non-legendary creature card in their graveyard.

As long as you own exactly one card named Mark
of the Passing in your graveyard or visible in exile,
non-legendary creature cards in your graveyard
have Eternalize {4}{b}{b}{b}. This cost is reduced
by {3} if the card named Mark of the Passing
is in your graveyard.