Exdeath, Void Warlock On the face, a 3/3 with a bit of life gain is only okay, but come the mid to late game, he transforms into a 6/3 or bigger trampler to put the game away
Most companions are tuned to work well with their respective Doctor, but thanks to the Doctors companion ability that many of them share, you can mix and match them as partner commanders
If either target of the activated ability is illegal as the ability tries to resolve, it will have no effect
For combo style decks only, I think
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Id happily jam this in any descend deck, but not bother elsewhere