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...
The Titans gone rogue, get down, sir... Titan 621, we
are friendlies, cease fire immedia - (unintelligible shouting)...
... Transcript ends//