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
By summoning one card that has no effect
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We exile up to 5 creatures from all graveyards and an opponent makes 2 piles of the selected cards and we choose one pile to go onto our battlefield
The Pokmon TCG: Bloodmoon Ursaluna ex Box includes
On paper, it seems pretty balanced and self-restricting, for sure there won't be any oppressive card with this ability