One of the many strengths of the Channelers of the Wildwood is their ability to heal their fellow Awoken. Upon our completion of the Rail, they agreed to extend this practice to other Hellborne in need.
Restore is a rather weak card in general - 2 health per card will not suffice for very long. However, it can be used strategically to allow a unit to barely survive a hit that would kill it.
The main use Restore has is to trigger Rejuvenate abilities - and it will often do so twice, since it also provides Regen. If you have this card, it is therefore often worth picking up units with Rejuvenate abilities.
You will typically want it removed by lategame, or at least upgraded with a Surgestone to allow one decent, cheap heal once per fight.
On Regen heavy builds, especially with The Sentient, Restore can actually be very potent and it could even be good to duplicate 0 cost Restore over other cards.
See: Version History