Freerunning is an alternative cost that becomes available after an Assassin or commander you control deals combat damage to a player that turn. It commonly makes spells cheaper or changes how powerful their effects can become.
Ezio Auditore da Firenze gives your Assassin spells freerunning, while Brotherhood Headquarters can produce mana specifically for Assassins and freerunning spells. Petty Larceny and Viewpoint Synchronization provide additional payoffs after slipping an attacker through.
