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All four of them

You Can't Control What You Mill There can be very specific times where taking cards out of your opponent's library crumbles their strategy

It wont increase your hand size, but if youre looking for a key card from your deck, Faithless Looting will bring you closer to finding it

[17] You cannot use any activated abilities that require tapping if the creature is already tapped

Then, unlike Hazoret's MonumentHazoret's Monument, it also serves as a haste enabler to keep our creatures aggressive, especially now that we can cast them cheaper

If you have the funds, you should pick up cards you think you might need in the future as well