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This fills up their deck again while forcing them to have to search for all these monsters anew
Here's the thing: how fast you collect the set (how many drafts you need to do, which is proportional to how many gems you need to spend, since you can't "go infinite" with ranked drafts) depends MUCH more strongly on how many "new" Rares you collect each draft as opposed to how many games you win
The fact that she can be easily tutored for, cheated out, reanimated and occasionally cloned only adds to her potential, despite her fragility in the face of removal
Her second +1 loyalty ability to exile the top card of your library and play it that turn also provides semi-reliable card advantage that Mono-red decks desperately need
that monster, along with any face-up monsters your opponent currently controls, loses ATK equal to the targeted monster's original ATK, until the end of this turn