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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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You then spend all four of your land drops playing and tapping the Simic Growth Chamber and then returning it to your hand, with the end result being that Summer Bloom is a ritual that costs two mana and adds six mana to your mana pool (exactly enough to play a Primeval Titan, which is where things get even sillier, since the lands you tutor up with Primeval Titan untap as well, and you pretty much just win the game on the spot, sometimes on Turn 2)
This effectively allows Adventures to function as two cards at once, providing them with a substantial degree of flexibility

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