Play passive in single elixir time, the best starting play is spear gobs at the bridge or mortar. Wait until double elixir to go for graveyards and make sure to always pair the mortar or graveyard with the dark prince or cannon cart as the tank.
The Graveyard is one of the win conditions of the deck. Pair it with a counter-pushing cannon cart or dark prince and use your spells to clear out your opponent's defensive units.
The mortar is great to apply pressure at the bridge and for defense in the middle to pull units in the range of both your princess towers.
Dark Prince is very important in this deck as it is used as the main tank for the mortar and graveyard.
In the early stages try to play passive and figure out what deck your opponent is using. Keep track of their main mortar and graveyard counters.
In the later stages of the game counter push with your defensive units with graveyards and mortars. Always make sure to have a tank down for either whenever you chose to attack.