Lifelink is a special ability in Magic the Gathering Tactics.
When a figure with Lifelink damages another figure, its controller's Planeswalker gains health equal to the damage.
The health gained is based on the actual damage done, not on the enemies health.
A planeswalker can have Lifelink with the black talent Demonic Lifetaker. This makes the planeswalker effectively heal itself.
When combined with offensive protection, such as first strike, lifelink becomes problematic to deal with.
The traditional Magic card game and the tactics game both give lifelink the same application.
There is give and take with the strength of lifelink between the games. Lifelink is stronger when having the choice of which creatures to attack and it is weaker when venerable to the same choice of the opponents.