Serpentine Inquisition

Capitalise {b} (You may cast this spell for its
capitalise cost and as though it had flash if you control
an unblocked attacking creature.)
Target opponent reveals their hand. You choose
a nonland card from it. That player discards that
card.
Secrets are the most valuable commodity within the
courts of Ophiocia. And, as with any currency,
extortion and thievery are commonplace.