I like the options that it gives you, and that it helps to stay relevant as you likely end up without requiring it to fix your mana early on and instead says relevant with lots of options to select
There are some playable cards in here, which I think is always nice
Furthermore, they were able to control the game with Number S0: Utopic Zexal, a card that is so powerful that it is currently banned from competitive play
By pitting Trainer against Trainer and Pokemon against Pokemon in battles that will rival even your most exciting encounters, Rising Rivals will raise you to the top of your game
Needing to play a bunch of creatures, needing to wait until your upkeep, and needing to pay two life to draw the card all constrict the power of Call of the Ring just a bit, but for two mana, this can easily fit into all sorts of decks
Storm went on to be a powerful mechanic that had a huge impact on Constructed formats