you will love the game (most people do) upon investing of 9.99$ for a month…
check on discourse for tips, people have completed the game without subscription (I did till desert)… [Tip for new people (good one)]
Subscription does make it easier, faster and thus steeper learning curve (with time). Also, it allows heroes with range/magic that changes dynamics of game and thus our strategy and code…
The creators of the game are working on a way to sell items that we buy… thus re-using part of gems spent before…
Other than that, more levels with subscription make users write more… this helps atleast me learn faster… learning with first hand practice.
Cheers