When you are to find a good tower to be used in soulkeep then you have to look for a tower that have a double weapon attack or have a special ability in attacking fiends as all you have to do is to have best towers in the field to be able to pass waves and in turn levels.
Because when you have a tower to be upgraded will act like those epic and rare towers that are in the market so you have to do a different plan when choosing towers and spells and pay with DEC as when you upgrade a tower which is common, it will be amazing and its damage and speed would increase.
Crystal Cannon is a rare tower that is pretty cool and can do a special feature that are not available in other towers in the common cards or even in the market and this is what you need to look for and this is what make your formation is strong against fiends in the battle.
It can be used with 130 Mana and also has a fire interval of 4.5 although it is so high but having a damage of physical and magical attack in this tower making it so special to be used and this is of more than 100 would be good for fiends that are with low HP and High HP and it would be amazing and for fire interval as I have said you can use gear grease with it or mana mania to gather more mana.
It can be used 3 times in the battle and as a rare tower it can be used only with level 1 and this is in league 1 so using it 3 times in the battle would be good as levels in league 1, the waves are no much and three times is enough for a tower that can be used with 130 mana.
