Braum - LoR

The card is already very strong without challenger, but because of challenger, all it takes is one stat boost to make Braum and unkillable monster that can solo win games. This issue is magnified because of the fact that there are currently an immense amount of cards that give stat boosts, way more than what there should be. This also doesn't even include the fact that if you somehow don't get any boosts, Braum is still an invaluable card due to his regeneration and high health for blocking, also being a 3 cost unit.