mtg the ring card Call of (LTR) #530 One Ring Card From Magic:

Strictly speaking, Adventure is a card type found on Instand and Sorceries that doesn't inherently do anything on its own

But there's nothing saying you can't put both of them in your deck at the same time for maximum punishment.

Cards like Suntail Hawk and Slither Blade make Mutate better, since they are powerful foundations to Mutate onto and attack with (since most Mutate costs are cheaper than casting the creature normally)

There are also some pretty nice instants in Historic like Sublime Epiphany and Discontinuity

Many players call this sets art and flavor virtually unbeatable

but I worry that a dedicated mill isnt going to pack the level of draw spells required to make it shine