Expose Weakness

Substance (You may cast this spell as though it had flash. If you cast it any time a sorcery could not have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next endstep.)

Enchanted creature becomes White and has Plainshome.
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"You thought you could masquerade among us? Your weakness was revealed the moment you hesitated. I will not do the same."- Edina, Mistress Of Malice