The Curse of Fenric (Surge Foil)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
[I] For each player, destroy up to one target creature that player controls. For each creature destroyed this way, its controller creates a 3/3 green Mutant creature token with deathtouch.
[II] Target nontoken creature becomes a 6/6 legendary Horror creature named Fenric and loses all abilities.
[III] Target Mutant fights another target creature named Fenric.