Theoretically, thats the idea behind cascade, although there are ways to break that purity, as there always are with effects in MTG
The option to pay a spell differently is usually stated in the text of the spell (or ability suggesting an alternative payment) and appears as follows: You may [perform an action] rather than pay [this object]s mana cost This is stated on Force of Will or Shining Shoal, as well as in the rules for Flashback, Overload and Evoke
It will be brief periods of time that I'll be finished - and then , I get to go back and update them all!"
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Generally those first two abilities, the draw and the mana production, are all you need to dominate games
For the most part, people think of sideboarding as a way to have access to cards that are very bad against a considerable portion of the field but that are very good against certain decks