Nightblade Silencer

Ninjutsu {2}{u}{b} ({2}{u}{b}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Nightblade Silencer deals combat damage to a player, tap up to one target creature. That creature doesn't untap as long as you control Nightblade Silencer. That creature's controller may pay {2} and discard a card at any time to ignore this effect until end of turn.