Energy Burn offered a lot more freedom with Energy, too, making it an interesting card to have on the field
As I went through the cards (and yes, I read every main-set card) I was only really impressed by the synergies, not the individual pieces
Whether you think Black Lotus or Time Walk should really be considered the best card in MTG history, there is a strong argument there as well
Between this suit of abilities, Omnath can provide such a massive impact on a game that it's not hard to see the reasoning behind its Standard and Brawl bannings.
Cards in different categories help you fill up your inkwell, which means you can put your more powerful characters into play
The only reason Sway isnt even more expensive right now is because its effect is more unfun than it is overpowered. Playing Sway effectively restarts the game (which most players hate), without even guaranteeing that the caster will end up in a better position than the other players at the table