Range in hearthstone can be easily explained, but is often misunderstood.
As Secret Rogue your range is much wider than most decks/classes.
If you need to play a late game value style, you want to be using your shadow steps as value generators on something like EVIL Miscreant, and more importantly you want to choose wisely with your discovers.
Cards such as Tog Scheme/Potion Of Illusion/Dragon’s Hoard as well Cobalt Spelkin/Onyx Magescribe from Lackeys can generate you so much value and longevity that you can easily become favored vs slower, value decks like Priest.
If you need to play for tempo and survivability vs a deck like face Hunter you can utilize your cheap cards for tempo rather than value, such as Step + Stunner, Prep + Evis, Backstabs and even just playing a solo Wand Thief or Stunner for tempo can help you keep pace with aggressive decks.
If you need to be the aggressor and end the game quickly you can play towards creating a big Edwin or Questing with cards like Preparation/Shadowstep/Backstab. These types of turns may often be viewed as “all in”, but in reality you’re only making these plays in specific match ups or when you’re forced to.
You do not want to get baited into thinking Questing/Edwin are your only ways to win, they are powerful but can be easily punished by multiple classes such as Mage/Warrior/Priest.
This is why understanding your range, and your opponents range is important in order for you to properly adjust the style of game you’re going to play vs each deck and class.