The reason is because it so much easier to sell the non-foil promo cards, so most players are aiming to earn 18-20 tickets, and even if you earned 20 on Day 1, getting another 70 is a tall feat, unless you have a way of combining tickets with friends/teammates
A lot of lists include OP03-078-issho, so try not to hold more than 5 cards in hand so they don't trash two of them
Graded Population Report: Hydreigon ex #223 Visualize the distrbution of grades in the chart
Here are the lists: Monkey Grow, by Jordan Boisvert (SCG Premier IQ Worcester 5/2015, 1st place Merfolk, by Hunter Nance (SCG Open Charlotte 8/2015, 2nd place Assuming both decks play out their standard gameplans, Merfolk will beat Monkey Grow nearly every time
Saint Traft and Rem Karolus is her backup - this will reward you for convoking with loads of tokens, which can only further your convoking efforts
I looked in box after box and finally found the card after an hour of searching