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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

And, well as u/TheSeigiSniper notes, Hobie would want you to proxy this card. Just saying

youre likely to pick up a key piece or two for one of multiple formats from the vast majority of booster packs that you open

As a two-drop with cost reduction, Ral enables these attempts as early as turn 1 or 2, punishing slower midrange setups

Things take off from there

While its one of the most difficult to play, its also the most rewarding