Looks interesting in the flashback-focused deck. I'm quite curious what sort of effects they're putting on white cards in that deck - most existing cast-from-graveyard abilities and synergies are in Grixis, such as
Kess, Dissident Mage,
Snapcaster Mage, and
Yawgmoth's Will. On the other hand, white has traditionally gotten cards like
Ashes of the Abhorrent.
...I suppose that
embalm exists, as do
Karador, Ghost Chieftain and
Kethis, the Hidden Hand. Geistcaller isn't limited to instants and sorceries, so maybe there will be some more creature-based recursion to go with the it? Hmmmm....