Freerunning is an alternative cost that can only be paid under specific circumstances as weve seen from the prowl and spectacle mechanics
I think it's mainly the +2 and the -1 that make Sorin powerful
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It's trivial to cast it for 1-2 mana most of the time, and if you're the one casting it, you can set up combos with cards like Boros Reckoner or Stuffy Doll, hitting someone for 13 right away