Mesmeric Orb function is incorrect
Mesmeric Orb reads "Whenever a permanent becomes untapped, that permanent's controller mills a card."
I played against this card and was required to mill a card for each individual land that untapped.
I contest that during the upkeep phase all lands untap in a single instance and therefore require only 1 card to be milled.
To separate each land as a separate instance is equivalent to placing each attacking creature in a separate combat phase.
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[Deleted User] commented
No, that is correctly handled. It's the same as "whenever a creature attacks", or "whenever a creature dies", etc. Each object gets its own trigger.