Your deck of cards represents your feedback, like the cards are the magic you know, or the creatures you can excite in your row to defeat your opponents.
Indomitable Creativity (red), Jund (black/red/green), Death's Shadow (black/red/blue), Rakdos Midrange (black/red), and more decks make use of this discard spell to absolutely hose opponents playing burn or other hyper aggressive strategies
I am sure expert players will laugh, but I classify the white cards in my mind as life-giving because of the white sorceries and instants that do just that
You can also use proliferate to increase the number of counters on the battle , making your opponents work harder to defeat it
You can manipulate your own deck to make sure youre hitting the best possible cards for this, but its also just good fun using your opponents cards against them too
While Arixmethes is a land, it's still green and blue, it's still legendary, and its mana value is still 4