Court of Emebreth might be the weakest if you arent the monarch since you only get a token, though it is a knight
Ensuring you can cast the spells you'd like is important, so whether it's Cultivator's Caravan or Absorb Vis you should consider some ways at lower mana costs to set up more expensive choices
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This six-mana black creature is a 6/5 with flying, and powerful ward effect that requires an opponent to sacrifice a creature if they want to counter it, and has an added effect of whenever a creature dies, an opponent loses two life and you gain two life
In addition, we have Elesh Norn, Mother of Machines available in this style
Spells and abilities that were targeting that permanent and Auras and Equipment that were attached to that permanent aren't affected unless the new characteristics of the object change the legality of those targets or attachments