Moat- 2w.  Creatures without flying cannot attack. Legends
Mystic Decree- 2uu.  All creatures lose flying and islandwalk. Homelands
Island Sanctuary- 1w.  During your draw phase you may draw one less card.
If you do so, the only creatures that can attack you are those with flying 
and or islandwalk.

This combo never fails to nuetralize creature decks.  In a blue white deck
it is especially strong if you include force of wills, counterspells, etc., 
to 
stop disenchants and other unsavory spells. Throw in a Hanna, Ship's 
Navigator from Invasion to get back your lost enchantments.  So how do you 
win? Defeat your oppenent by deck death. Since you don't need to draw, after 
a while they will just wither away and run out of cards. My personal favorite 
method of winning.
                                                 - Dema Spack2000@aol.com