There will be an update on 11/30 balancing some cards. Here are the details from http://clashroyale.com.

Mega Minion: Damage decreased by 6%, Hit Speed decreased to 1.4sec (from 1.3sec)

  • As one of the most used cards at the top and in challenges, Mega Minion is clearly in need of some attention. It offers a lot of value on defense and fits into almost any deck, so we’re looking to reduce its damage output and make it a less obvious choice

 

Elixir Collector: Production Speed increased to 8.5sec (from 9.8sec), Lifetime decreased to 70sec (from 80sec)

  • Our last change took the Elixir Collector from a heavily overused card to a relatively underused one, so with this change we’re aiming for a middle ground! Increasing the Production Speed, but reducing the Lifetime, will give you a quicker return on your investment and make it a bit more rewarding to play – while still maintaining the risk aspect.

 

Poison: Damage increased by 10%

 

Tombstone: Spawn Speed decreased to 2.9sec (from 2.5sec)

  • Tombstone is the most used building at the top, so we’d like to rein it in a little bit. Decreasing the Spawn Speed will result in a slower trickle of Skeletons and 2 less over its Lifetime.

 

Lava Hound: Lava Pup Hitpoints decreased by 1%

  • This is just to fix an inconsistent interaction with Crown Towers vs. Lava Pups at certain levels.