they have Stage 1, Stage 2, and/or special mechanic evolutions
The combined collection is said to be worth tens of millions of Hong Kong dollars
As a card draw engine, its not very efficient
However, suzu and kane are also different types of ceremonial bell, with suzu in particular closely resembling the spherical "jingle" bells Westerners would be more familiar with
Team CMU solved this by adding Gaeas Blessing, which would reshuffle (Emrakul style) whenever flipped by Oath of Druids
I think I view this deck as more as a step for players looking to take that next intermediate step after learning the ropes, which is a very cool theoretical space to design for, and a space I think is a little underserved at the moment