For tributing one monster, you get a 2500 attack beast, which in old school Yu-Gi-Oh is seriously powerful
You can mill this card or discard it to another effect, and still unearth it with haste to catch someone off guard, and its much better when you have discard synergies
These chromatic displays, which may be a nod to holofoil cards, are unlike anything else Target stocks
Each foe mills 2 cards and you can exile an enchantment, instant or sorcery in their graveyard under the 2nd spell's cost and cast it for free
Given Sanctum of Stone Fangs, exists, its somewhat debatable whether this ability is needed, but its definitely still strong
With a card like Marketback Walker, you can draw as many cards as you want this way, allowing you to find your Walking Ballista or Torment of Hailfire to finish things off