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The main deck strategy revolves around the synergy between Retreat to Coralhelm and Knight of the Reliquary. With that combination online you can basicly fetch almost all lands from your library, making Knight huge in the process. Retreat also plays well in combination with fetchlands and Coiling Oracle.
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The way I understand the combo, you can tap each land you fetch for mana before sacrificing it to fetch the next one. With this in mind, have you thought about including something like Kessig Wolf Run? You'd need to include at least one Forest Mountain or Plains Mountain to fetch with the Knight and to tap for red to pay for Kessig, but trample and a power boost to the Knight is well worth it. Alternatively, Rogue's Passage makes the Knight unblockable for the turn.
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Now that you mentioned it, I think I have seen a similar deck somewhere that utilized Kessig Wolf Run. I'm not sure if it was Modern or Legacy though. I might try Rouge's Passage first though, seems less of a hassle to fit into the deck since I don't have to add another color. I was thinking about adding Emeria Angel just for the sake of fun but I dunno, might just end up being an uneccessary "win more" card.
That might be worth considering for sideboard as it allows you to go wide. You just have me an idea. Using the Retreat + Knight Combo, you could deal damage directly via Valakut, the Molten Pinnacle and any Forest Mountain / Plains Mountain. The trick here is having two sacrifice targets for the Knight, so that you can fetch Valakut off the first and continue the combo with the second.
That's a good tactic to be sure but I might just try a different deck/build for that, I'll keep this one in BANT colors. But the Valakut synergy really seems interesting, didn't even think of that.
Down side to the Valakut option: the deck is effectively 4 colours. Or at least the land base is. This can be an advantage too as it gives access to a number of red cards too. I also just realised Knight of the Reliquary decks have a natural enemy: Blood Moon (and Magus of the Moon). I've been testing a Modern Moon based deck these last few weeks and I'm really enjoying it.