I have checked this one out. While my goal was giving it the proper formatting, I decided it could see some improvements, and in return half of it has been changed. Please OP, give it a try. :) If you don't like the changes for any reason, they can be easily reversed.
Another person has copied you with little to no difference in the final result, despite my changes you two might want to sort it out.
Really good strat. I tightened the script it up a little to soak Beaker's Headbutt with the Starlette then swap to the Whelpling. It will keep using the Whelpling until it wins or dies then swap to the Direbeak.
Unless stunned, an H/H Starlette can pull out an additional complete WU regardless of the Scales' RNG. Less sturdy breeds can too but within tighter circumstances. It makes Nexus Whelpling likely to trigger dragonkin racial for its Mana Surge. This will be what I'm going to contain in the new description.
Could you tell me what's the point of Powerball? You're both slowed and against a flyer, and for the damage alone you don't always get the third round to pull it out.
You can't always survive to land the 2nd WU on Breaker if you get crits from Scales and/or Breaker's Headbutt. The Powerball is just a filler but could help weaker Mana Surges guarantee the racial trigger.
I only use the PP IS and Nexus, so It's not really necessary for my setup. I haven't crunched the numbers to see what happens with less powerful breeds.