Port of Dark Secrets

Give yourself a taint counter, {2}{t},: Investigate
(Create a colorless Clue artifact token with
"2, Sacrifice this artifact: Draw a card.")
Fortify {1}{b},{1} {u}, or {3}. ({1}{b}, {1}{u}, or {3}
Attach to target land you control. Fortify only as a
sorcery. This card enters the battlefield unattached
and stays on the battlefield if the land leaves.)
"The first secret is where the shadow market it is, then
there are the inhuman prices its traders demand.