Basically, if your opponent is playing a creature deck aimed at attacking your life points down to zero, then this card alone will easily prevent that
The adventure portion, Garenbrig Growth, returns a creature or land from your graveyard to your hand
It seems real strong, but only time will tell if the deck is a flash in the pan, or if it has the staying power to succeed alongside current top-tier strategies like Affinity and Eldrazi Tron
However, like Necropotence, it was eventually pushed to such a degenerate place that fewer and fewer games were actually interesting when it was on the table
But Ward 2 helps a lot with that problem and Vigilance means that Marauding Sphinx is likely to dominate the board for multiple turn cycles
And if you have ten or more life over your starting value, she becomes a 10/10, which is a huge threat, especially in a Vampire deck