Durant goes down to anything doing decent damage (1/2 decent if fire), leading to "easy" 6-prize strings.
Exactly! Which is where the skill in playing it comes from!
If it were an auto-pilot Durant deck, as soon as the opponent got out one big attacker that could do 70+ damage per turn, the Durant player has lost.
The fun of the deck is pulling out a win when the opponent has gotten that beast out and is ready to pull that string of prizes.