You get soo much disgusting value out of this, and the difference between a Plains and non-Plains here is just massive, as opposed to 1 damage, a single +1/+1 counter, or making their guy not untap
to cascade, you exile cards from the top of your library until you exile a nonland card with mana value lesser than the cascade card, which you may then cast from exile without paying its mana cost
I explain my thoughts on the matter here.
He cackles with glee when I draw some of the lower-level minion cards like Goons or Flounder, because he knows that those cards are not exactly the key to victory
I suppose it does have Planechase text, too, but Im not here to encourage that sort of behavior
Its better than Harrow despite the fact it retrieves just one landit grabs any land, and thats a rare and beautiful thing