Nekrataal

First strike
When Nekrataal enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

"You can't protect them all, Jace."
—Vraska

The List

His victims don't have time to feel despair.

Eternal Masters

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Commander 2014

Duel Decks: Jace vs. Vraska

Tenth Edition

First strike
When Nekrataal comes into play, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Nothing happens if there are no nonartifact, nonblack creatures on the battlefield when Nekrataal enters the battlefield, but if there is one, you must target it, even if it’s a creature you control.