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You cant, for example, sacrifice one creature to both Phyrexian Altar and Ashnod's Altar because costs for multiple abilities or spells cant be paid simultaneously

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And, of course, theres Dockside Extortionist

Yes, it holds Aggro like few creatures do and turns any trade into food for other copies of it, but a high-interaction format like Standard and Pioneer present many risks for a more conditional creature: there is little point in playing around its mechanic if, at the moment of transforming, Cecil takes a bounce or a Cut Down, or any other removal in response, and you have wasted your resources for nothing