Notably, the returned Rats don't need to be among the cards you milled, so if a powerful Rat gets removed, Ashcoat can easily get it back so long as you don't mind milling four cards (and that effect can play into graveyard synergies too)
Sure, drawing seven cards is great, but its impact is lessened when everyone else is doing the same
It's an excellent jumping-on point for any newcomer to Commander, and a great addition to the collection for seasoned players.
Its real shame
Keyword counters and Shield counters work too, as well as any other hyper-specific counters you can shuffle onto Hancock via The Ozolith et al
How to Pre-order LotR: Tales of Middle-earth Fans can pre-order Tales of Middle-earth on Amazon or at a local tabletop games store, and expect to pay around $20 for the Starter Kit, $60 for a Commander deck and $60 for a Bundle