Wickersmith's Tools (021) - Commander: Lorwyn Eclipsed

Whenever one or more -1/-1 counters are put on a creature, put a charge counter on this artifact.

T: Add one mana of any color.

5, T, Sacrifice this artifact: Create X tapped 2/2 colorless Scarecrow artifact creature tokens, where X is the number of charge counters on this artifact.