In addition to the card's other abilities, it also has a card draw effect that activates after an opponent plays their second or more spell on their turn
Youve also got Tiana, who not only counts as a cost 6 in singing songs, but then whenever you play a song, each opposing character gets -1 strength until the start of your next turn
Strength and willpower is more important for non-evasive characters, which tend to get involved in challenges more often
I've seen that some players are using them in casual Derevi decks, and this seems like the perfect home for Keeper of the Nine Gales, thanks to its untap effect
Since Voja often leads elfball decks, you can expect to land this on turn 3 or 4, often before your opponents can handle the unreasonable ward cost