mtg exile cards from the top of your library until Bituminous Blast [Archenemy] put it into your hand Do you still pay mana

We also dont want to whiff or run out of them, so balance (or shuffling them back in later) is key

These are the booster packs to make it easier for players to choose which pack to buy and reduce inventory issues for smaller stores

To use another metaphor: the architect spends far less time than the builders who have to come in and make the house happen

This can sometimes refer to self-mill, for effects that care about graveyard size or quality, as Lab Man/Thoracle or reanimator decks.

Number Four Avenger of Zendikar, on the other hand, is a pretty heavy hitter in both Commander and competitive formats

Let me know in the comments below, or on the Draftsim Discord/Twitter