Aside from just being a good card, I think the most important impact of Traverse the Ulvenwald is how playable it makes Ruin in Their Wake
11: Put X +1/+1 counters on target creature, where X is your life total
Those include ones with powerful EtB effects, powerful ongoing effects, ones that dominate the board and ones that are really hard to deal with
For a low-power build with 6 cards in each of the ten pairs (60 cards in a 99-card deck), it draws 4.81 cards on average most often 5, with about a 60.7% chance of 5 or more
Charmander, Squirtle, and Bulbasaur all got Illustration Rare treatments, and they're some of the best-looking cards in the set
Hopeless Nightmare is banned