color help

[AdamS]

i want to build a deck geared for a
{Barren Glory}+{Decree of Annihilation} win
so i know i need red and white is there a thire color i should add

[CommanderUnderSorin]

Blue for  {Quicken} don't wait for the next upkeep! Don't risk it!

[fj76ts4]

{alchemist's refuge}

And play lots of ramp and X spells as side win cons like {molten disaster}

That would make it 4 color, unless OP's playgroup uses the nephilm or he wants to play 5 color

[abstractApathist]

Blue for  {Quicken} don't wait for the next upkeep! Don't risk it!

I agree with this. Blue also offers using {Zedruu the Greathearted} as your commander so you lose the least from board wipes.