Each of those three steps has its own kind of check and approval process, which takes a decent amount of time. Though Arita usually gets the name of the attacks that will be on the card, he doesnt usually get a description of the move
Because Helm of Obediences ability only stops milling once it has either milled X cards or a creature, if you have a replacement effect in play that exiles cards when they go to the graveyard, the Helm never sees either of its conditions met, and it just mills the entire library
He wont play your game, Mister
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Bouncing all nonlands for seven on your turn is basically just a worse Cyclonic Rift, but the ability to end an opponents turn if you pay the extra three is really something