That one's simple: the only cards I'd even consider would be Urgent Schedule (bricks like a mofo because of so few targets), Union Hangar (getting out ABC is too easy without it, it would likely be a dead card), Time Maiden (it's good, but not THAT good), or Flying Pegasus Railroad Stampede (too weak an effect)
Still, its one of the better and more flexible 4-drops you can play in decks filled with noncreature spells, and you can use it to manipulate combat in your favor and gain some life
This is also true if something puts the top card of your library directly onto the battlefield, without you having to play it
There will be blood
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Immediately upon fast traveling to Marthas Rest, head up the steps into The Golden Stables