Recs.
Updated
M&M Clash of Heroes is a strategy puzzle RPG based on the Might and Magic series that costs $4.99 and has zero in app purchases.
SpecsUpdate
Pros
Pro Interesting mix of match three and RPG
Players are in a traditional RPG world and do level up characters as they would in an RPG but the main gameplay mechanic is match three where players line up their troops against an opposing team doing the same. There is also defensive aspects to the field, so it is a bit more involved than a traditional match 3 game.
Pro Combat involves a reasonable amount of strategy
By using many different mechanics such as charge timers for moves as well as matching and moving certain groups on a field in order to perform defensive or offensive maneuvers allows for many different strategies that can be used to win a battle. For what is essentially a match-3 game the level of planning that can be used is pretty deep.
Pro Lengthy campaign
M&M Clash of Heroes has a lengthy campaign, even for console standards. Clocking in at around 24 hours to beat the game it will provide a tons of playtime that for the cost of $4.99 is difficult to find anything on mobile comparable with that type of storied campaign.