If this card is equipped to a Fairy monster, it gains 1000 ATK. If this card is equipped to a non-Fairy monster, it cannot attack, also it loses 1000 ATK. If this card is sent to the GY because the equipped monster is destroyed: You can target 1 "Prinzessin" you control; equip this card to that target. You can only use this effect of "Glass Slippers" once per turn.
That's assuming Mage Power wasn't in those 10 cards you paid on the first turn. This deck is a gimmick, it'll work once against people who see it the first time and attack, and that's all it has. And I guess if you really feel like it, you can remove the Glass Slippers (not protected by Stromberg) and done. Oh yeah, and I also just bought my second Spirit Barrier :)