I get it is a mill deck but the win condition seems kind of iffy. Could be fun though. Think you gave me an idea...
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Your evolving wilds are near worthless and will only slow you down. Might as well make them basic lands. In fact your other lands are going to be slow if you don't control an island/mountain/plains.
It feels like you are trying to force this. I guess it could be fun casual, but getting infinate mana to cast creatures and draw yourself out is ok. I liked it because I think it is creative and I think you are onto something. Keep digging and maybe find something more. Also you lack a lot of control so your combo is easily broken.
I like it. I can see where the hellrider can be thrilling. I'm in the midst of making a r/w flicker human deck. The malcontents just seem too good to pass up with some cloudshift.
Risky drawing those miracles in your opening hand. Will make it very slow going.
I'm not sure you have enough creatures. Surgical Extraction can really tear you apart. Take a look @ my r/u Delver see if there anything you like or dislike about it. I am currently only running 20 mana so I can't fit the "loothouse" in either for due respect of needing the colored mana.
There is a lot of comments and I didn't read them all, but instead of Bloodline Keepers maybe drop them for more control and go with Grim Affliction