Its a small edge, but given how rarely Void Shatter or Scatter to the Winds matters, Im gonna lean towards using Broken Concentration as my Cancel of choice, at least initially
The name EDH comes from the first legendary creatures to helm the decks in 1994, the elder dragons, and fandom of the movie Highlander for the singleton building restriction (There can only be one.)
So yes, its about 5-10 times easier to get a nonfoil, and 2-3 times easier to get a foil, depending on if the card would be rare or uncommon
If its a permanent spell, you get a token copy that gains haste, but must be sacrificed at the beginning of the end step
From the Dredge/Hogaak players side of things, opening hands with something like Natures Claim look more attractive than normal
Perhaps you flicker something like Quantum Riddler or Novice Inspector for value, or you kill an opposing token, or just remove a blocker so you can attack for lethal