Sharptail, Nezumi Interrogator

Commander ninjutsu {b} ({b}, Return an unblocked
attacker you control to hand: Put this card onto the
battlefield from your hand or the command zone
tapped and attacking.
Whenever a Ninja you control deals combat
damage to a player, that player reveals their
hand. You choose a noncreature, nonland
card from it. That player discards that card.