In a multiplayer game, if creatures you control deal combat damage to multiple opponents at the same time, the last ability will trigger multiple times
a subsequent rescue attempt turns out to be a trap
Elsa - Spirit of Winter also has a nice 3 points of Lore awarded for questing, and has a high Willpower stat of 6, so she can absorb a lot of incoming challenges
If X is 4 or more, draw a card
There are only a handful of different Enchanted cards available in each set, and they are mechanically identical to the regular versions of the card
Her I Trust You ability lets a player look at the top two cards of a deck and take one into their hand every time she quests, generating plenty of card draw and making it easier to get a specific target