Time rewind

Hi, it's just a little idea but a spell named time rewind resurrects all dead troops within .. Tile radius, maybe an idea?

Name of Spell time rewind
Training Cost (usually in gold) free but you pay all the elixer costs again
Targets troops
Effect Type resurrect?
Damage Type/Amount (if applicable)-
Training Time 45 min
Description a spell that resurrects all dead troops within .. Radius
Research/Spell Levels 1 is double elixer costs 2 is normal 3 is halve 4 is halve and +2 radius and 5 is a quarter and plus another 2 radius

Lab Level 6

Can somebody say something?