Nightshade Assassin

First strike
When Nightshade Assassin comes into play, you may reveal X black cards in your hand. If you do, target creature gets -X/-X until end of turn.
Madness {1B} (If you discard this card, you may play it for its madness cost instead of putting it into your graveyard.)

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 {1}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Time Spiral Remastered

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 {1}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)