Spearing the towers
The spear goblins make the baby dragon in an uneasy situation
Especially, after you use a huge elixir amount cards like with and baby dragon in the last minute then to use the spear goblins with only waiting for 2 elixirs to refill; you can combine them and make a devastating cards combination with can guarantee you a tower down.
Combining the Spear Goblins with huge amount elixir cards at the last minute
A devastating impact with the mirrored dragons combination