It's quite mathy, but he goes into a great deal of detail and explains his rationale, while not ignoring the realities of the game (there are one-mana Cycling cards, cards that fetch lands, cards that tap to add mana which aren't lands, and more.)
Here's all you need to know about legendary Pokmon
It is flexible in that it can pivot from questing to challenging based on the board state, and it can take advantage of quite a few synergies to give you the upperhand
That's data, and I care about feelings, not numbers
However, once you figure out which ones work best for you, stick with them
Vedalken Orrery grants flash to all the spells in your deck, and its not surprising that its one of The Command Zones most recommended cards for Commander