Ghostly Flicker is interesting, but I don't think it's better than Snap. Snap is cheaper and more flexible and untaps the same number of lands while also rebuying Snapcaster Mage (instead of doing one or the other), though admittedly Ghostly Flicker rebuys Snapcaster Mage for no additional mana. Not that mana's usually the issue. How has your testing of Ghostly Flicker been going?

