Most Psychatog and blue-green decks that started playing with Standstill ended up switching to Deep Analysis
It stops opponents cards, and finds you more cards
By making them both uncommons that green-black was happy to play, the cost to put them in your deck was low enough that you'd take them both, and then it's time to Ragnarok and roll
However a few do have "practical" uses - here are some examples: The particular card you reference, Garruk the Slayer, was created for the Magic 2015 prerelease and is used in a variant where one player plays normally and the other plays as Garruk
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I also managed to pick up two copies of Courier of Comestibles basically a pizza delivery person on a moped who searches your deck for a Food card or creates a Food token