Double strike makes her a powerful attacker and makes her an excellent candidate for combat damage triggers such as Sword of Light and Shadow
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It can give another creature protection and the chance to be unblockable against monocolored decks
Most people think that Dark Confidant or Tarmogoyf are the best creatures ever printed and this may be so for constructed formats but in the cube I prefer the Snapcaster to both and think it is a very strong contender for the best dork slot in all of Magic
Though undoubtedly strong, this card is probably a bit too slow to be main-deckable in Modern: three mana for the sword, two more to actually equip it, and then you have to get through to deal combat damage as well
Cost/ramp package: Kinjallis Caller, Otepec Huntmaster, Knight of the Stampede, Explore, Glimpse the Core, Sheltering Landscape