When you play another Unseen, Bisma gets a random battle skill.
Entomb: Give one of your units Bisma's battle skills.
Card sounds may differ from in-game as they get updated.
Entomb - The ability of a unit with Entomb will activate when it dies. This combines well with effects that sacrifice units as a cost.
Battle Skills - The Battle Skills are Aegis, Berserk, Charge, Deadly, Double Damage, Endurance, Exalted, Flying, Killer, Lifesteal, Overwhelm, Quickdraw, Reckless, Revenge, Unblockable, and Warcry.