Willow the Wise

Silent Protector
Target creature gets -10/-10 until end of turn. If that creature is a Cat, it gets -20/-20 instead.
If there are no Cats on the battlefield, you may choose to give target creature -5/-5 and create a 4/4 Dog creature token.

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With every step, Willow moves like a shadow, quietly shielding her family from harm, unseen but ever watchful.