Old Kayran wouldn't have worked with the "can damage Golds" change. With this change you can get upto 12 as your clutch card on the last round.
Apart from that, Kayran has a similar potential.
The highest it used to reach was 24. 8 + 8 + (the highest monster unit power) 8 = 24. Now, you can get 4 + 6 = 10, but also minus 6 to the enemy = total of 16, not to mention you deny them any on-going abilities.