You can use it on your turn to protect your combo or hit an opponents creature to keep them off the board
The simplest way to speed things up is to utilize your abundance of mana rocks to your advantage
But every time, you have to ask yourself the question, "What if they have a counterspell?" If it's not going to make a big difference whose turn you cast it on, and you don't want your spell to get countered, go ahead and cast it now
Being able to scry away unwanted cards is also a huge boon for decks that use Scroll Rack and Senseis Divining Top, both of which are cards that white decks commonly use to get decent card selection
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(2020-04-17) A nonland permanent card is an artifact, creature, enchantment, or planeswalker card