How about a new spell that gives you that much needed extra seconds to get 100%.

Name - Overtime

Unlock- TH 10

Level 1
Cost to make - 28000 Elixir
Adds 7 seconds to attack time

Level 2
Upgrade - 3 million elixir
Cost to make - 33000 Elixir
Adds 15 seconds to attack time

Level 3
Upgrade - 5 million elixir
Cost to make - 36000 Elixir
Adds 25 seconds to attack time.

Or it can be a dark spell reversing time during an epic battle. Once used there is a dark/Purple loom over the screen.

Level 1
Cost to make - 1000 Dark elixir

Level 2
Upgrade - 45000 Dark elixir
Cost to make - 1250 Dark elixir

Level 3
Upgrade - 60000 Dark elixir
Cost to make - 1500 Dark elixir