#21 Zombies are really neat in that they occupy different space than a lot of other tribal synergy in that they enable graveyard and value aggro decks, but it's not exactly an onboard mechanic like say devotion or normal tribal tends to be

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While it does suffer from costing four mana a slot thats pretty crowded, as things go it deserves to be there, as this is definitely a four-mana play that can take over games
Wherever Reprocess is good, so is God-Eternal Bontu
As you can imagine, there aren't many decks that can come back from such a devastating combat step
Then it has rebound so you get one free cast from exile on your next upkeep