Karmic Guide
This is just the start of the list, I didn't say these were required. I used (must have cards) to refer to highly vertical cards. I didn't say the list was complete and I even asked for other gaian's input.
So...your definition of "must haves" does not mean "must have?"
Can't say I've heard the phrase "highly vertical" before.
Anyways, Mox Diamond and Thawing Glaciers I can give you a pass on. Few people have access to them and few people seem to remember them unless they own 'em. Sol Ring and Expedition Map are pretty much things that you should have thought of long before StP, PtE, or almost anything else on the list.
The main issue I take with the list is what I alluded to with my response to Zeddicuus: Magic is so highly situation and potentially synergistic that almost any card can be a solid pick - or a firm exclusion - based on the deck. For example, you're not going to run Wrath or Day in a Rhys the Redeemed deck, because it doesn't make sense. Similarly, a deck that has only half a dozen creatures (which I was considering as a concept deck recently, using Autumn Willow as the general and a surprising amount of green defense) isn't going to care about Wordly Tutor, BoP, or Piper. Heck, I led the design of a Mishra, Artificier Prodigy deck on Gaia - and it's still around here.*
As a result, this means that your list is pretty much gonna explode into almost every mediocre and above card or be pruned down to only artifacts and lands.
*If you want to see it, ask for the link; it's faster than trying to dig it up.
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