Unlike mill, however, lifegain is rather popular
You can't divide damage dealt by a single source between them
Cid, Timeless Artificer Cid, Timeless Artificer is an interesting build-around that I imagine comes in two flavors: You either go hard on looting, cycling, and self-mill to throw multiple copies of Cid in the graveyard, or you do some Mirror Box shenanigans
Devouring Light offers a little more interaction at a great price if you have Sentinel Sliver, and Back to Nature is included for the same reason as the first deckI dont have enchantments and without it, Detention Sphere and similar effects are a great way to permanently deal with my creatures, but they become a liability if I can kill them all at once
However, its in Arthurs ability that he truly shines: when played, he can give a chosen character Challenger +2 and Resist +2 (that means they get +2 Strength while Challenging and a reduction of 2 damage thats being dealt to them), plus they can also challenge Ready, not Exerted, characters on the same turn too
He's fabulous and versatile, making this a great card to pick up if you're looking for a consistent way to repeatedly draw cards