You can play a card like Black Mage's Rod on turn two, but you're often reluctant to trade because you'll lose your triggers, and it's too expensive to equip later to continue to accrue triggers
Further Reading: Cards Rising in the Post-Nadu Modern How Has the Print Change for Secret Lair Affected Prices So Far?
I cant emphasize enough how powerful taking game actions, like drawing cards, by spending zero mana can be so I think Sanguine Spy might be secretly pretty good
It ported over to the UW Humans and Bant Company decks of Shadows over Innistrad Standard, and even broke into Modern for a time (back when Celestial Collonade and Vendilion Clique were the bread and butter of the deck)
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The copies are created on the stack, so they're not "cast." Creating a copy won't cause abilities that trigger when a player casts a spell to trigger