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According to the comprehensive rules: if there are fewer than N cards in your library, you may reveal all the cards in your library. If you cast a card with ripple 4, and there are only 3 cards in your library, you will just reveal all three of those cards
Note: Some card effects like mass land destruction spells, would have dominated the list
In many decks, Dawn of Hope's other ability is just a bonus, and those decks might hardly even bother with it until they need a mana sink later in the game
The first time I properly met Simon was at Pro Tour Oath of the Gatewatch, where his team, Team Eureka, broke this deck out into the world after previously only being seen as a fringe deck on Magic Online (funnily enough, the CEO of ThreeForOne, Oliver Polak-Rottman, was also part of Team Eureka!)