Faithless Looting and Cathartic Reunion also give the Dredge player the means to dig through their deck normally in search of a Natures Claim or Abrupt Decay, so your Grafdiggers Cage is likely to be answered within a few turns
If the first attack knocks out the opponents Active mon, the second attack hits the next Active Pokmon, essentially doubling up on your turn
Considering that the precon itself is selling for almost $50 on Amazon, unless you are planning to build a poison deck and can use most of the cards, snagging singles is likely the way to go in this case
This means you need fewer lands for the deck to function
Just be wary of complicated microtransactions that will be hard to fully ignore if youre looking to collect them all
Again, this is more prevalent in the Drytron lists, but any deck that doesn't need its normal summon can most definitely use this