Culling Scales - mtg.wtf

2004-12-01 If the lowest converted mana cost is 3, Culling Scales can destroy itself.
2004-12-01 If the targeted permanent doesn't have the lowest converted mana cost when the ability resolves, the ability doesn't resolve and the permanent isn't destroyed.
2004-12-01 Most tokens have a converted mana cost of 0. A token that's a copy of another permanent or card has a converted mana cost equal to that permanent or card's converted mana cost.
2004-12-01 You choose the target. If there's more than one nonland permanent tied for lowest converted mana cost, you choose which one to target.

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