White is fine I guess, it's just... not very exciting? It obviously has some very good cards, but nothing that I see in a pack and think 'well, this isn't the best card here, but let's see what cool stuff I can do with it'
The fact that Magic's been around for 20 years and some people have been with it for that long is scary, and newer cards are less obvious reminders of our own mortality.
Also they're pretty!
The 1WR legend is a cool card but I'm not really sure how to abuse it. Flame Jab?
Hedonist seems really good to me. It's a decent 2-drop that randomly ramps you into T3 Chandra Nalaar/Thundermaw/Zealous Conscripts/SGC/Thragtusk/Wolfir Silverheart/Batterskull/Precursor Golem/whatever. It's also...
CML, is Galepowder better than another Resto?
I don't think the answer to black's PW problem is to add Sorin; sadly, there just aren't really many good black 'walkers. Liliana is cool though and works well with the miracle theme CML suggested.
If you're having a problem with a pileup of 4-drops (and most Cubers are, the first step is recognizing it), I wouldn't cut Rampager, which is rarely an actual 4-drop and more often a car crash for 2 mana.
meh, Blood Moon is a minor annoyance for U/X Tron in my experience.
btw, if you want something that's surely terrible but awesomely fun:
4 Explore
4 Farseek
4 Heartbeat of Spring
1 Garruk Wildspeaker
3 Sphinx's Revelation
4 Cryptic Command
3 Supreme Verdict
4 Remand
2 Path to Exile
3...
Firestorm trades card advantage for brutal efficiency. I find I often have excess lands, removal spells (which otherwise I'd have to use on those creatures anyway), or cards I can't cast yet that I'm happy to cash in for damage.