Given how slow the format is, players can spend an enormous amount of mana to sc scry for lots of cards -- enough to make the ability worth using in make X a huge number and scry enough cards for it to be highly efffective with a 100-card deck
That's especially true with the Mardu precon, headlined by Terra, Herald of HopeTerra, Herald of Hope
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
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)
Emerald has access to a number of evasive characters that are hard to challenge