I always run 10 fetches. 4 Catacombs, 4 Heath and 2 Flats. And Dryad Arbor's a staple in my list as well. I rely very heavily on my fetches the first few turns. I fetch basics as much as possible. I don't run them specifically to interact w/ Guile though, I run them b/c it allows me to run only 21 lands (counting Arbor as a creature here, not a land) and still have 14 initial mana sources of every colour. Now here's the thing - if I know I'm running this many shuffle effects (10 fetch, 4 GSZ and 4 Explorers), why not create some synergy and get some extra value out of them? Whether you run Guile or Library, it allows you to be on par w/ blue in the card selection department without interfering w/ your gameplan. You get value from them simply by doing what you always do - fetch and GSZ like a madman.
On the quality of the card selection of Guile or Library - it doesn't matter all that much. If for some reason you can shuffle between Guile and Library triggers, it's probably b/c you set it up and chose not to shuffle at an earlier moment.
As for 1-drops vs. Chalice decks - that's more of a question of whether they have it or not (they'll only have it in hand about 40% of the time, and they'll also need a Sol-land to go with it), of whether or not you'll revert back to running a number of Abrupt Decay or of whether or not you'll try to get creative and either ignore it and execute your plan via GSZ or GSZ for Qasali Pridemage or something similar to deal with it.
Actually, in your second case having Guile out over having Library in hand makes a lot of difference. The chance of you getting your next hate card just got 3 times bigger, seeing as next turn you'll see 3 new cards instead of 1. Even if you don't have a single shuffle effect, you now have access to cards 2 turns earlier than you would have otherwise. Continuing that line into Lost Legacy b/c you dug it up early w/ Guile is considerably better than drawing into something that doesn't interact w/ your opponent for 1/2 turns and then drawing into Lost Legacy. You might have gotten Library out the turn after you dropped Guile, but that still means you would've waited for that Legacy an extra turn.
As for your last case - Paying 8 life to draw 2 w/ Library vs. ANT/TES seems like a rather dangerous proposition. You're now dead at stormcount 5. 4 if you've played 2 fetches.
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