Scars of Demacia

Both Demacia and Freljord have strong buff spells, and Garen/Tryndamere both benefit greatly from them. These cards are also good for keeping your Scar units alive and trading. Bjerg guarantees you to draw a Garen/Trynd, and because you have multiple copies he can also tutor for Judgement and Battle Fury. This should give you easy access to strong spells in the lategame and you'll easily overwhelm your opponent.