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*Commander Rin and Seri, Inseparable may be FOIL*
The most common patterns with Specter of Mortality will be to cast it and give other creatures -2/-2, but the sweeper effect can scale and the Specter wont be affected at all
You could add black to your deck with Clara Oswald or Vislor Turlough, though, canonically, Donna or Rose Noble would be the way to go