Freerunning

Freerunning is a keyword ability that offers an alternative cost. It only appears on some Assassin creature cards, and was introduced in Universes Beyond: Assassin's Creed. 
==Description==
You may cast a card for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or with your Commander. It still functions if you're not playing Commander, but then only for Assassins. The Assassin and/or commander doesn't even have to be alive or under your control. As long as it dealt combat damage to a player earlier in the turn, the freerunning cost is now available to you.
Casting a spell for its freerunning cost doesn't change its mana value. 
Freerunning is a variant of Prowl from Morningtide. The designers wanted to care about Assassins rather than Rogues, and he also wanted to take off the text about sharing the same creature type as the spell (as they weren't planning to use Kindred in the set). This allowed them to rename it to something referencing an action skill in the video game, freerunning. In the video game, freerunning is the name of the acrobatic parkour skill used to navigate settings, fluidly climb buildings, and jump from architectural and natural structures, primarily used by the members of the Brotherhood. 
Freerunning, the mechanic, shows up in every color but is focused in black. To help make it more relevant to Commander, in addition to Assassins, the designers referenced commanders as well.
Because of its connection to another IP, it is unclear if Freerunning can be reused on future Magic cards.
==Rules==
==Rulings==
*Once an Assassin creature or commander you control deals combat damage to a player in a turn, you can cast spells for their freerunning costs for the rest of that turn. It doesn't matter what happens to that Assassin or commander after that.
==Examples==
==Cards that grant Freerunning==
*<c>Ezio Auditore da Firenze</c> Assassin spells you cast have freerunning .
==References==