Sure, you might steal their win condition or prevent them from using it to their advantage, but even then, itd seem contradictory for them to play game-winning cards while youre discouraged from doing the same, right
Honestly, the cost to do this is rather expensive, but considering that this ability is stapled onto a mana rock, it definitely passes the bar on a lot of mid-power Commander decks that have counter synergies
By and large these mechanics go unused in favor of the stronger and arguably more reliable mechanics that have come to make up the backbone of key decks
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Sacrifice after III.) I Crescent Fang Search your library for a basic land card, put it onto the battlefield tapped, then shuffle