Just don't rely on summons,though they are effective relying too much on them could be useless in the long run. Use them mainly to buy you some time to plan your attacks.
Guys in this game the reset button appears only once for the board of resources to reset. So if you press it once you wont be able to see it again in the whole game. I want everyone to know about this so please press the plus button in this comment so that others can see.