Siegfried, Famed Swordsman, for example, may be a 2/2 when in your graveyard, but chances are, it will enter with a ton of extra +1/+1 counters on it
They make an even more potent pair than usual in these iterations
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If you do that four times, you get the creature on the battlefield for free
Theres definitely a deck where using Cogsworth Illuminary Watchman to make her challenge whatever is a good idea
There is a fair amount of crossover here with the white-black sacrifice decks, which is helpful when building a deck because there are more black cards that work for both