Into The Frey is the 'best' card so far, because taunt Warrior has been a favourite of mine since un'goro. Ofcause that perspective is heavily drenched in arbitrary subjectivity. 

It might not be tier 1, but in my personal opinion, fun is better than win rate :)

I apologize for poor gramna and sentence structure, I am word-blind :) don't know if it's called wordblind in english, like it's in danish