We plan to release the next version of Decked Builder to support New Phyrexia when it is released, sometime in mid May. As part of the release, we will have to support the new Phyrexian mana symbol. You can read more about it from here:

http://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/arcana/686

We are thus taking the opportunity to clean up our database of cards as well and add support for split cards and flip cards, which currently do not work very well. As we will be changing the database entry for these cards, decks which contain these cards might not load properly after the patch. Hopefully this is not too big of an inconvenience. 

Although there are 63 cards on the list, I believe that the main cards being used are Budoka Gardener and Nezumi Graverobber, as I have gotten a few emails for proper support for those cards.

The full list of cards which will be affected are below, as well as a sample screenshot of split card support.

Split Cards (23 cards)
Assault // Battery
Boom // Bust
Bound // Determined
Crime // Punishment
Dead // Gone
Fire // Ice
Hide // Seek
Hit // Run
Illusion // Reality
Life // Death
Night // Day
Odds // Ends
Order // Chaos
Pain // Suffering
Pure // Simple
Research // Development
Rise // Fall
Rough // Tumble
Spite // Malice
Stand // Deliver
Supply // Demand
Trial // Error
Wax // Wane

Flip Cards (40 cards)
Akki Lavarunner
Autumn-Tail, Kitsune Sage
Azamuki, Treachery Incarnate
Budoka Gardener
Budoka Pupil
Bushi Tenderfoot
Callow Jushi
Cunning Bandit
Dokai, Weaver of Life
Erayo’s Essence
Erayo, Soratami Ascendant
Faithful Squire
Goka the Unjust
Hired Muscle
Homura’s Essence
Homura, Human Ascendant
Ichiga, Who Topples Oaks
Initiate of Blood
Jaraku the Interloper
Jushi Apprentice
Kaiso, Memory of Loyalty
Kenzo the Hardhearted
Kitsune Mystic
Kuon’s Essence
Kuon, Ogre Ascendant
Nezumi Graverobber
Nezumi Shortfang
Nighteyes the Desecrator
Orochi Eggwatcher
Rune-Tail’s Essence
Rune-Tail, Kitsune Ascendant
Sasaya’s Essence
Sasaya, Orochi Ascendant
Scarmaker
Shidako, Broodmistress
Stabwhisker the Odious
Student of Elements
Tobita, Master of Winds
Tok-Tok, Volcano Born
Tomoya the Revealer

Picture