I sub grim discovery in against Jund and valakut. It is good for bringing back my sacrifices and fetch lands as you stated. My personal favorite is when it helps me bring back tectonic edge. Just as Jund positions itself to light you up with bit blast and broodmate you smack their dual and multi color lands and then use discovery to bring it back and do it again. I ran this deck in a tournament last night and it finished in the top four. It tends to struggle against mono white. I need to find a solution for that, if there is one. I will check out your other suggestions. Thank you for the feedback.
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