Imperial Stormtrooper

Tyranny {2}{b} (You may cast this spell for its
tyranny cost rather than its mana cost.)
When Imperial Stormtrooper enters the battlefield, if its tyranny cost was paid, put a
-1/-1 counter on target creature an opponent
controls.
Stormtroopers are known for being the most feared
soldiers in the galaxy. That is, if and when they can remember how to aim.