E VS O :
-train earth and water.
if the enemy used an archidon make him stuck by the water who you trained before and attack the archidon with the earth.
if the enemy used swordwraths make a lot of earth and attack him, you can attack his miners.
if the enemy trained just miners attack him fast and kill his miners.
Note. if he have castle archer you die.
E VS C :
- try to train 2 fire and 2 water.
then make an explosion.
if you maked airs the enemy can attack you with bombers.
E VS E :
if your enemy trained a lot of earth units try to use just the fire unit.
(sorry for my grammar :P)
if my strats sucks so don't use them