At the end of September Clash Royale will get a new troop, the Inferno Dragon. That in itself is no big deal until you look at how this new dragon attacks.
As the name suggests, the Inferno Dragon’s attack is similar to that of the Inferno Tower, it builds up damage over time. It is a single target, short ranged troop with high hit points and damage.
Clash of Clans has recently inherited a number of troops from Clash Royale, and troops with this capability would be welcomed in Clash of Clans.