Lost Spirit

Lost Spirit is an common neutral minion card, from the The Witchwood set.

Strategy
Lost Spirit is an excellent addition to minion-heavy Aggro decks such as in Zoolock or as part of a Call to Arms package, as it can potentially offer 6 extra Attack on a full board from its Deathrattle. Of course, a timely board wipe can make Lost Spirit have no effect on the board at all.

Trivia
Her summon quote is perhaps a reference to the poem Ode to a Nightingale by John Keats:

tender is the night,

and haply the Queen-Moon is on her throne,

Clustered around by all her starry Fays;

But here there is no light,

Patch changes

 * Added.