There is also a new combo from Theros: Beyond Death with Underworld Breach, but it requires more money and some deckbuilding changes
(2017-08-25) If Shifting Shadow can't become attached to the creature you put onto the battlefield, most likely because that creature has protection from red, it becomes attached to nothing
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From there you could refill your hand with cards like Windfall and Time Spiral - the latter of which would also untap Tolarian Academy in the process
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