Organic Extinction

Improvise (Your artifacts can help cast this spell.
Each artifact you tap after you're done activating
mana abilities pays for {1}.)

Destroy all nonartifact creatures.

//Transcript follows...
Titan 621, we are friendlies, cease fire immediately...
Sir, I don't think it cares about IFF anymo-...
(gunfire)... (unintelligible shouting)...
... //Transcript ends