Well it felt to me it was time to burn my hands on Saruman and going for the "Many Colours" idea as well.
Saruman is little under priced (stats add up to 15, while cost is only 14). He can get you any sphere you like but using his resources will get you closer to your downfall. His hit points should be equal to those of Gandalf since either of them shouldn't surpass the other. He excels in attack, and his willpower is obviously better as his defense.
Since Saruman made his own ring, and the 3 elven rings give respectively Leadership, Lore and Spirit. Giving him Tactics seemed the best option. Next, searching your deck for a card and putting it on top of the discard pile enables some crafty setups with card return effects. Finally, it allows you to be sure that you have the proper resource icons at any moment because of Saruman. Important notice is that these cards have never entered your hand, so Silver Harp isn't applicable.
Edited by Jban