The sliver creature type was later introduced in the Tempest block
Since her copy effect has no limitation on uses per turn, and no cost other than tapping, all you need is an instant or sorcery which can untap Stella while producing any other cumulative benefit
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(That reminder text really feels wonky to read for some reason.) Rooms, on the other hand, take a few key elements of double-faced cards, and then sprinkle them on newer variants of split card types
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It's worth noting that commander tax will make this a fairly mana-intensive gambit so this plan is unlikely to be playable in faster metas where your decks have to be leaner, faster and more efficient than the decks you see in casual play