Populating the battlefield with an army of aggressive Rat tokens can quickly overwhelm an opponent and become a constant thorn in their side, which is exactly what Totentanz wants
for example, Siege Strikers tap ability never mentions vigilance, but it allows you to get a lot more power out of your vigilant creatures
You could stack your deck so that you never draw another land or in such a way that Goblin Charbelcher gives an instant win
Drawing two more cards, even if you have to cash in a token to do it, is one of the best things you can do in that scenario
Often, the rarer cards also are known for featuring the best artwork, or as in the case of Enchanted cards, offer artwork variants from other standard cards that are more stylized and impressive
Theres also Sliver Gravemother, who according to lore is the first true Sliver Queen, and current ruler over that unnamed plane of Sliver origin