If you asked me last week, I wouldve said my favourite colours in Magic: The Gathering were black and blue
Will effect the board in a big way in just about any deck or will allow for a very strong deck to be built around it if it is a commander
The biggest problem you'll run into is that the creatures you steal will come in to play under your control as Treasure artifacts, not as creatures
Or do you have any highly sought after, high value cards in your collection
You could play Disenchant, Power Sink, or Duress - from your hand or from another stack
Additionally, Slimefoot causes each opponent to lose one life and for you to gain one life whenever a creature you control dies, synergizing greatly with the sacrifice-heavy strategies that are sped up by the disposable tokens Slimefoot can produce