This includes the upcoming Tarkir: Dragonstorms and the extremely popular UB set dedicated to Final Fantasy
Again, like the Elder, you generally wind up playing planeswalkers over Den Protector due to their overall cost being in the same sort of range
Its Ice form is pretty solidly the worst because Blizzard doesn't bypasses accuracy checks in Hail in gen 3 yet, and besides that Hails has no advantage like the other weather effects do
Reverse holographic cards, even more thankfully, always used the same code out of all of a cards possible codes
However, it being instant speed fixes a lot of potential downsides and gives us some flexibility
Serious collectors hunt for vintage grails, mint holos, and anything from iconic sets