I wouldn't say "bad". You're essentially hurt in several ways: White has
1) the fewest instants of any color
2) the least card draw of any color
3) the least ramp of any color
The first one can't be helped too much (other than Vedalken Orrery), but there are artifacts for both the other issues. In fact, arguably white or green is the best color for Skullclamp, white because of all the 1/1s, green because of all the mana dorks.
Private Mod Note
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Card advantage is not the same thing as card draw. Something for 2B cannot be strictly worse than something for BBB or 3BB. If you're taking out Swords to Plowshares for Plummet, you're a fool. Stop doing these things!
1) the fewest instants of any color
2) the least card draw of any color
3) the least ramp of any color
The first one can't be helped too much (other than Vedalken Orrery), but there are artifacts for both the other issues. In fact, arguably white or green is the best color for Skullclamp, white because of all the 1/1s, green because of all the mana dorks.
On phasing: