Kiyoko, the Shadow Moth

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.)
Ninjas you control get +1/+1 as long as an opponent has three or fewer cards in hand.
Whenever Kiyoko, the Shadow Moth deals combat damage to an opponent, that player's maximum hand size is reduced by four until
your next turn.