You need to play retract and opals if you want to make any use out of the grape shots.
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I love it! Minotaur tribal seems pretty fun, probably not very competitive, but fun. Why not use some madness cards instead of fatal push and go for the throat? You will be discarding with Neheb and bloorage, so you may be able to capitalize with fiery temper. Also, I feel like Kragma is a very expensive trap. By the time he'll be hitting the field, you should already have a strong board presence given that he cost 5, maybe 3 if you're very lucky. I feel like you could get more value from Boro Reckoner, but RRR might be hard to pull off in such a black heavy build. And technically not a Minotaur, why not throw in Mogis, god of Slaughter? He's pretty much a Minotaur God in spirit and probably a lot better than kragma. Cheers