After Ether's ability resolves, the next instant or sorcery spell you cast that turn will be copied whether or not it has targets and whether or not you spent the mana added by Ether's ability on that spell
15 MTG cards per Booster Pack
As they are both Category IV Characters, they will grant Rydia [15-083L] Growth Counters, but that isnt all
I think you could win, and many of these cards are cheap to acquire, so a budget deck here is pretty simple
Forget your regular 6-sided dice and bring all your D20 cards from AFR if you really want to maximize your chances of winning with this enchantment
I've not spent a penny on TCG Pocket, and never plan to, aside from redeeming and, I promise my deeply forgetful self, cancelling the free two-week trial of the premium subscription down the line