Hymn is a cheap two for one and it is disruption which isn't something you can easily find on other cheap card advantage cards
This coincides with mechanics that resist keyword compression: Sagas (with numbered chapter abilities), modal double-faced cards (effectively two cards), and adventure cards
Obscura Confluence One generic, one white, one blue, one black Instant: Choose three
For the more control-oriented versions with Thunder King Rai-Oh as well as the more combo-oriented ones, the idea is to leverage the absolute power of Absolute Zero (pun intended) and put your opponent in a very difficult situation if they want to get over him
Tag Team GX cards feature two or three Pokemon combined into a single powerful card with elevated HP and a GX attack
Its a lot of work, but its hard to argue with