Generally, when building your deck, pick a strategy or theme and stick with it. If you want a rush grinder, go with something similar to that shrieker rush you played earlier. If you want a fun, less efficient deck, go spam fallen elf with photons and fate eggs. Don't try to do both at once (without SoSe, anyways.)
When you add a card, if you really want it to be a major part of your strategy put in many copies of it. Otherwise, its just a random grouping of cards that don't have a collective function.