Its +1 also keeps your own hand full, all while it inches opponents closer to defeat
Is Aftermath an Activated Ability

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Also, having Heros Downfall in the mirror match, especially post-sideboard against players who bring in Revoke Existence and Glare of Heresy to kill Detention Sphere, is pretty sweet
With the amount of incidental token making decks do these days, I won't be surprised to see this across the table eventually
You just want to take the card that will help you win the most on its own at this point, be it a big, bomby creature or a solid piece of removal to take out your opponents bomb