pokemon scarlet and violet base set booster box Pokémon - & - each with 10 cards Scarlet & Violet | Pokemon

I think there are two reasons: Using Waterfall instead of Horn Attack leads to the same result

Treasure Cruise is close to free once you get its cost down to a single blue

Since Karlach gives all attacking creatures first strike as well, this makes your creatures even better attackers since they'll have a lower chance of dying in combat

Nevertheless, Dig Through Time, like Treasure Cruise, was extremely powerful in Standard, very pushy but overall a really positive contribution to the format that helped make Khans of Tarkir one of the best-designed sets the game has ever seen

Cards that ramp for two lands are traditionally good in Standard