(To mill a card, put the top card of your library into your graveyard.) Monstrous War-Leech's power and toughness are each equal to the highest mana value among cards in your graveyard
Usually there are two that are drawn by the same artist
In this case, you'll still create a Treasure token

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A year ago, exactly none of them had
I've played a fair bit of Zur, the Enchanter cycling in my time, and I can tell you the biggest issue with cycling is that it can be hard to close out games once you get your engine going