Grum Flameblade is probably one of the funnest cards to use and win with but requires building a team around supporting him. Unless your opponent sets you up really well, by not putting a proper tank you definitely need to make sure that you put in some cards that are going to support him and make sure that he has the best chances of getting a kill. I am going to be breaking down some of the Chaos Legion cards you can buy/rent that are affordable and will make your Grum quite a menace that can tear apart most teams.
EXPLODING RATS
This card is my go to when I am playing Grum at any league, Not only is he guaranteed to take a hit for grum but he is going to soften up the first two cards on the other team making it easier for Grum to get a kill. In gold this card gains redemption which is going to soften up the entire enemy team and set you up nicely.
RADIATED BRUTE
Another really cheap card that will give you more focused fire towards the front and ensure that you are more likely to be taking out the tank faster than you normally would.
SCAVO HIRELING
Even at a low level this card will make your Grum way more lethal especially against magic teams that normally would ignore armor. With Grum this card basically acts as a heal since he has Void Armor
Let me know what your favorite Grum combos are in the comments.