During the week of November 8, 2016 this card was available in a weekly card pack, along with Alpha Barrier and Radiant Mantle. You can still earn the contents of that pack through weekly quests.
Stab Link, in addition to 1.4Health Regen also has an Unique Active which teleports your hero to a target point up to 1500 units away. The active can be used in a z-axis, allowing you to blink into elevated areas. Consumes 20% of your base health (not max health) and can't be used for 5 seconds after taking damage from an enemy Hero. Cannot be activated while Critically Wounded.
Activating the card will play a sound effect hearable by all players.
After blinking you will retain 150 Movement Speed.