The test was putting it in your deck in the first place
Being able to draw a card every time you cast or copy an instant or sorcery is an easy way to get card advantage
(You may cast a spell for its prowl cost if you dealt combat damage to a player this turn with a creature with any of its creature types.) You can cast a spell for its prowl cost any time in a turn after a creature you control of a matching type has dealt combat damage to a player
Theres a balance to be struck between these two, and thats the fun of building around them
However, this decision would make more sense if we got more Partner commanders representing other antagonists from Final Fantasy 16
Obviously, Magic's designers expect you to use this card as a combat trick or pump spell in a werewolves deck, turning your creatures from their less dangerous human side to their scarier wolf forms in the middle of combat, while also getting the benefit of a one-sided fog