Trainer/Supporter can benefit you (and your opponent) in multiple ways
Despite what I said earlier about variance, this actually takes out a big part of the variance in the game, as you will never be short on mana or draw a land that you dont need
Get Lost only costs two mana to cast, making it trivial to have the mana to cast it
Several cards care about specific words or letters appearing on cards, the number of words that appear in various places, or other wordplay
The detail in each snowflake is breathtaking, with dark and light shading existing in harmony
This model of playing Hearthstone is completely free, everybody gets the same opportunities and cards, and its something that you can play with absolutely zero cost and time investment