How to play
Straight forward control deck. Look for 2g 2b 1p influence for the early game. Ideally you want early removal, or draw to dig for your aoe to stabilize. Once you run them out of gas, play a blocker if needed, and setup your staff if you have it. Then just defend your flyers with removal and win with them. You will win through card advantage, and sometimes you can just double channel face for lethal.
Against control decks (ex deep freeze) you want as much draw as possible. Don't play units untill you're ready to force out their units to harsh rule them, unless you need blockers.
Other options
If you have jotun's feast caller, I'd suggest adding 2-3 in place of the staffs and 1 valk. This isn't the cheapest list, but utilizes a lot of cards from other decks I made and decks I can make in the future. Crafting cards that will cross over to multiple decks is the best strategy for f2p.
Edited changes
Cut valks for yetipult. Deck needs to deal with aegis and weapon decks better. This card does both, and makes for a smoother curve that stes up harsh rule.
Cut 1 thunderstrike dragon for 3rd copy of staff(Jotun if you have it) To often I would get 6 dragons stuck in hand when im behindand stuck at 5 mana for 2-3 turns. Adding more chance to draw and providing 4 armor that can net you an extra turn in bad spots. The fourth copy never matters, you usually only play 2-3 at most and bottom 1-2 off of strategize