Since Wizards of the Coast doesn't put color limitations on removal spells these days, nearly every creature printed is vulnerable to spot removal in some shape or form
Initially, there was talk about Wurmcoil Engines, Dark Confidants, and Brainstorms coming to Historic, which I found concerning
Between Caesar, Legion's Emperor and Mr
Being able to ramp the best land out of the top four cards of your deck at instant speed is already very useful, but the fact that you can still draw one of them into your hand as a fall back means that you wont have a major downside (see Growth Spiral for a similar effect)
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My only major mana sinks late game are the two Campus Guides