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Central Elevator is a room tutor and Promising Stairs is the actual wincon, though you'll need a supporting cast of just about every playable room in Magic right now, which also means you're probably playing a Marina Vendrell Commander deck

And its god-like when drawn from the top of your deck

The activated ability is super expensive for what it is, and cost reduction barely matters in Limited

Cemetery Reaper doesn't just enhance Zombies, though

You can easily get for 3+ damage in most white builds, which is quite efficient (do try to avoid trading early though, as it can hurt you later)

If youre brewing in Standard or Pioneer, its one you should consider