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Oathsworn Vampire and Feast of the Fallen are probably the two best examples of this, and they both rely on Innistrads worldbuilding to be successful

Its either a very cheap resurrection for a small creature, or you pay the going rate (I miss Zombify) and get a big creature, potentially up to a 10/10 with this set

Youve then got Rotwidow Pack which can make Spider tokens, and also has each opponent losing life equal to the number of Spiders you control

I expect this format has some hidden gems we dont even know about yet, and Im looking forward to seeing what decks will emerge in the coming weeks