|If you hit an Eredar Lord with enough Wisps, it will explode. But why?|
|See this card on Hearthpwn|
 How to get
With its zero mana cost, Wisp is primarily valuable for use as part of rogue combos, such as in a 'Miracle' rogue deck. It also works well with cards like Edwin VanCleef and Questing Adventurer which are improved by cards played. Such combinations aside, the Wisp's low stats and lack of useful abilities generally make it less desirable than other low cost minion cards.
"Wisps are fey nature spirits who build night elf structures and gather resources. Wisps have the power to detonate, causing a backlash of mana, and can become Ancients. Several thousand of them, known as the Ancestral Spirits, gathered at the call of the Horn of Cenarius to Nordrassil to destroy Archimonde."