When it comes to foils, I like Mythics far better. But cheap rares (I’m looking at you Rest in Peace) seem like no brainers.

Tasigur has been my favorite spec, I preorderer 20 playsets at $6 a playset when they first came out. Just about every financer wrote them of as to expensive to cast (it’s funny, that was the same thing they did with dig thru time and I got 25 playsets at $5 a playset). when the first big tournament hit I sold them for $45. I rolled that into the foils. I picked up 22 foils for between 20 and 25 each. Then when tasigur bottomed out I picked up 60 plus copies at around $5 each. Now I’m just waiting for them to get to my selling price. I may be holding them for quite a while because I see the foil as the next future tarmogoyf.

I think the Walkers are insane in Affinity, so I’d say that if you want to play with them absolutely it’s ok to buy in now. I actually think they are going to go up again in the short term as people start using them more and more outside of Standard, and I have a inkling that Walker may be the “best” card in Standard post rotation — so wouldn’t be surprised to see it go up after BFZ Standard metagame settles in. Unless the card gets a reprint I don’t ever see it having less than a $12 price tag at any point and the upside is very high two or three years down the line.