Abigail, Persistent Inquisitor

At the beginning of each combat, you may pay {x}{w/b}{w/u}{u/b} to have X target creatures gain shadow
until end of turn.
Whenever a creature you control with shadow
deals combat damage to a player, add {1}. You
don't lose this mana as phases end. You may look
at and play the top card of each players library
that was dealt damage this way until end of turn.
"What I need to know is how long did you think you
could keep this from me? "