Quote from DrewReaLeeA lot of people have been asking if my Sacred Foundrys are for trade the past few days at my LGS. Today, one of my friends asked me for them even though he doesn't play Standard and plays blue religiously, but he didn't reveal why he wanted them as he said he just wanted them. Sure enough, both versions of Sacred Foundry (especially the Gatecrash one) have been ticking up slowly. Are people speculating on these because of the god Iroas putting Boros over the top or something?
I can't say for sure exactly what the cause is, though Naya Hexproof and R/W Burn rising to prominence doesn't hurt things.
What I can say for sure is that this trend predates the spoiling of Iroas - I know that at GP Phoenix, CFB was accepting Foundries for $10 in store credit but was only offering $6-8 in trade credit for the others.