Theres eight Set boosters in the box, and the first one I opened included a rule set for a pack battle-style mini-game in which both players make a grid of cards and take turns revealing and comparing the stats on each
If players felt like at least some meaningful percentage of the money Wizards is making off of products they might not personally like were going to help improve and fund the aspects of Magic that they do personally care about, then players would probably be way more forgiving with things like crossover products and Secret Lair drops
Here are a few more guidelines to use as a starting point: For a 40-card deck, if you really want to have a land that produces a certain color of mana in your opening hand, you should play at least ten lands that produce that color (eleven or twelve to be safe)
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Examples here include Unburial Rites, Deep Analysis, and Roar of the Wurm
This creature gets +X/+0 until end of turn, where X is the mana value of that card