Because Dark-type energy at the time also provided a passive plus 10 damage buff to attacks, Sneasel could easily hit for one-shot knockouts against any target
With one card and the cost of 0 Don, you can add 9k power to your board, its insane
(You can only gain this effect once per turn.) You can banish this card from your Graveyard, then target 1 monster with 800 ATK and 1000 DEF in your Graveyard, except "Eidos the Underworld Squire"
If you're prepared to wait a few turns for Dinosaurs on a Spaceship to come out, it can create a flying dinosaur army for you all by itself
And the result is a card that goes from a box to a wall protected, displayed, and finally visible
You can also do some pretty funny things with Brash Taunter