Also, it's the most valuable trainer card in this set
These decks rarely have maindeck ways to remove Nether Void so most of the time we can just win by installing it on the second turn (just pray for them not having 1st turn Kird Ape)
However, it was chosen as it seems the interpretation most faithful to the original text wording
On the other hand, the art is a rare humorous offering from Terese Nielsen, from the Herbalists cheeky grin to the heck-no look on the patients face
A few times I asked staff about stock, and the answer always came back as some variation of the following: "We don't get them in very often
[2] During the Standby Phase: Each player can Special Summon 1 monster from their GY, ignoring its Summoning Conditions, but banish them when they leave the field