Nightshade Assassin

Nightshade Assassin

Creature - Human Assassin | Power/Toughness: 2 / 1 (CMC 4)
First strike
When Nightshade Assassin enters the battlefield, you may reveal X black cards in your hand. If you do, target creature gets -X/-X until end of turn.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)