And yet, you still have to get your own hand down to almost nothing in order for that strategy to work. So, let's look at the entire strategy on paper.
You have to discard 2 cards from your hand with Regirock to bring back an energy and attach it to Regirock so Exeguttor can have 1 more energy to discard with it's second attack. At the same time, you have to try to take out the opponent's Claydol through any means neccessary or shut it down for 1 turn with Mesprit. At the same time, while discarding cards from your hand, you have to make sure not to refill with Claydol at certain times so that you can use Exeguttor's second attack to force the opponent to a low amount of cards. That is like 3 strategies rolled into the same deck.
I find it hard to believe that any player could work towards all 3 strategies at the same time. I feel the deck would need to focus on one of the 3 strategies (energy acceleration, power denial, or hand shortage) to do well at it. Trying to accomplish all 3 just means that all 3 will be accomplished with less strength to them.
It's easy to come up with these ideas on paper and think they are going to work, but I honestly believe that when it comes to real games at real tournaments, it wouldn't work (exactly to plan) as it was meant to.
On another subject, where are more Sample entries? From someone sitting outside of this event, it sure seems boring not being to see any ideas or anything. The tournament has completed many rounds, yet 99% of the membership on this forum are completely oblivious to it since there is no communication and sharing with them of the details. It's like, "oh look, that person is doing well....and that's all there is to see...okay, next thing for the day."