Mill is a very parasitic strategy, which makes it both easy and risky to draft: youre either all-in on milling your opponent out, or youve spent a lot of time and cards accomplishing nothing
Feline Ferocity provides three distinct archetypes to build around: Go Tall, Go Wide, and Equipment
Also, she specifies each turn. These both help with deckbuilding constraints, as well talk about shortly
Then you can give them indestructible, so it's an answer to mass removal or targeted removal or just a combat trick
This speaks to Iron Man building and crafting as he attacks
However it does lead to some consistency issues, most notably the lack of burst card draw: while cantripping ravenous cards are nice, we need a few more cards that can draw more so we avoid topdeck mode