Nightshade Assassin
From Commander 2019 set
Nightshade Assassin
Creature — Human Assassin
2/1
First strike
When this creature enters, 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.)