Stormscape Battlemage [Commander 2013]

Kicker {W} and/or {2}{B} (You may pay an additional {W} and/or {2}{B} as you cast this spell.)
When Stormscape Battlemage enters the battlefield, if it was kicked with its {W} kicker, you gain 3 life.
When Stormscape Battlemage enters the battlefield, if it was kicked with its {2}{B} kicker, destroy target nonblack creature. That creature can't be regenerated.