Yes, it works in that way, you need to put something like a stamp or rim colour on your card and use it, to unlock Sepia, Noise and Used, for that specific card, the advantage in comparison is, that once you unlock multiple of these customization for one card, you can switch the foil between them freely (between sepia, noise and used ofc.), without losing the items, like starlight or aurora, which will disappear when you change it's foil
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So, you got a bunch of copy effects lined up for your adventure spells but you dont have any adventure spells to pull ahead with
Elspeth, Undaunted Hero is a slightly expensive white planeswalker that can use its ultimate loyalty ability to mass pump your creatures based on your devotion to white