You need these faction levels to unlock the cards. You can achieve that by playing against the AI.
Lvl 10 needed for Plasma Storm
Taken from my only basics deck lists:
Add a comment
Get big and then hit them.
Play Minions. Buff Minions. Hope you don’t die. Hope they do.
Just punch them.
A budget version of classic Eggmar with a more aggressive playstyle.