This design adds authenticity, making them especially desirable to collectors
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Initially, there was talk about Wurmcoil Engines, Dark Confidants, and Brainstorms coming to Historic, which I found concerning
Heres what we know so far: Mega Ultra Rare Mega Ultra Rare cards debuted in the Mega Brave and Mega Symphonia Japanese sets and will see their first English release in the Mega Evolution expansion
Once you have a big board, you can use End-Raze Forerunners to make a big swing, you can use Skullclamp to cash in tokens for more resources, and so much more
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)