A lot of people are complaining about the upkeep cost of this spell. After building the deck, I haven't noticed it impact anything at all. In six games, I have opened with this turn one, gone into the princess combo, and won two turns later. Now, my sample size is definitely small, but the loss of 10 cards from your deck once has yet to actually prevent me from winning a game.
After 20 games, the deck has bricked exactly four times, which isn't bad. The Koaki matchup is the biggest issue, as Golden Core negates the destruction effect on attack,and deck has mostly weak monsters.
It's still a work in progress, as I need to add someway to protect Pumpkin Carriage and try and find an answer to both Silent archetype's as well as Koaki Meru. Here is what I'm running right now, after buying one full box:
2x Glife
3x Prinzessin
3x Pumpkin Carriage
2x Canadia
3x Golden Castle
2x Iron Cage
3x Glass Slippers
2x Silver Bow and Arrow
Gameplan is very straightforward: play Golden Castle turn 1, summon Prinzessin, trigger her effects, equip her with everything I can, beat face. Thanks to her ability to attack directly while Pumpkin is in play, I can usually end most games on my third turn.