shrine cards mtg MTGNexus where X is the number of cards in all graveyards with the same name as that spell. Top 10 Shrines in "Magic:

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Release Date: Oct 13, 2023

It might well be too narrow for the cube having only really one home but I would still expect it to get more play in constructed decks than it has (which is also none)

I think this happened enough that it was clear that more answers to planeswalkers were needed, and now most removal spells can directly destroy planeswalkers

Slightly easier to answer but no less daunting, the number of unique cards, where you only consider the first printing of each card, brings your total up to a huge 36,108 cards