Riverchurn Monument is the kind of mill card that scares me, because it tends to combo with a bunch of mill favorites like Bruvac, Phenax, God of Deception, and ways to make players mill a lot of cards (Maddening Cacophony, anyone?)
A common sequence of plays is a turn 2 Cogworker's Puzzleknot into a turn 3 Maverick Thopterist followed up by Herald of Anguish on turn 4
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One possibility is to cast Apocalypse, a card that gets rid of everything, including your hand, leaving you only with Barren Glory, but that needs to be done on your upkeep, so there are options like Leyline of Anticipation or Emergence Zone to give these spells flash
Their weirder interactions are fun if you understand them, but you must explain them every time you play against someone for the first time, and your opponent never quite believes you at first
Its a board wipe, and thats huge, but the 6/6 creature is only going to be around for a couple of turns