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Credit: Wizards of the Coast Terisian Mindbreaker BPhillipYork: Well that's certainly compelling, milling half their library is almost certainly going to be 40+ cards, with something like a Bloodchief Ascension on the board that's probably game

And to be fair, that's not entirely on them

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Its even seen solid play in Modern from time to time, and was a go-to win condition in Legacy storm decks during the early days of the format

Finally, question 3 requires you to consider the needs of your deck

Since there's no color restriction you can slot Conjurer's Closet into practically any deck, though a little bit of ramp is nice since five-mana is a bit of an awkward amount when you normally will want a higher impact card going into the mid-game