Magic's videogame crossovers continue to not suck

Way back in 2008, the Morningtide set introduced a mechanic called Prowl. It let you play cards with the creature type Rogue for less mana if you'd damaged another player (rather than their creatures) earlier that turn. The Assassin's Creed crossover brings Prowl back, only renamed Freerunning and with its reduced cost applied to the Assassin creature type instead. That means if I can sneak even a single point of damage past an opponents' defenses, I can bring down a whole gang of bargain bonus Brotherhood buddies immediately after.