It was a potent (and frustrating) element of the Flash-heavy Dimir control deck, where you could Surveil through your entire deck, recur your best cards, and never deck if you had two of these
Satsuki, the Living Lore is the first-ever commander option designed specifically to synergize with this dynamic card type
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In fact, Mother of Runes is so good, there was a modified reprint created for Modern in the form of Giver of Runes, where they added an additional toughness, but they took away one of the strongest parts of the card: the Mother being able to protect herself by targeting herself with her own ability
Instead, it lets you search your library for a Swamp card
Then, for its fifth chapter, it gives all of your other creatures a +2/+2 boost as well as the real kicker, indestructible counters which stick around, making your entire team pretty tough to defeat