Its Decree of Pain but more painful
Note that Fenrir counts itself for the Ecliptic Growl trigger, so your opponent needs to play a 4/x to stop it from drawing
This is a really fun enchantment, and while its more of a shoe-in for decks that want vanilla creatures like Ruxa, Patient Professor, its honestly not the worst enchantment finisher for a deck full of evasive bodies like Merfolk, or Edric, Spymaster of Trest
High Risk The "Creator" Strategy: Design a game or custom asset, print it on demand, and sell it repeatedly
I have a feeling it might not be quite as good as those cards, because this format looks like it is probably going to be faster than Kaldheim, but it looks pretty solid to me Even without the upside against Blue decks, Hunters Mark would be a very good removal spell for Green