you need something to get you artifacts back. anything that hates on your artifacts kills all your creature base as well.
Creeping corrosion blows your board, yeah you can get forge out but it wont help if your always relying on on a 9 drop that also you will most likely have to tutor up.
Open the vaults is screaming to be in the deck. Or even something as
simple as eternel witness. Also 11 changlings is kinda high. i know you want that
scarecrow etb of
reaper king but that comes with 11 other cards that can help control the field (imo wht a good
reaper king deck should be doing) or even just
simple utility crds.
Kuldotha forgemaster would tutor up that forge and put in play for the cost of three artifacts, daretti can get useful artifacts out of your grave back to the board,
Saheeli Rai would be solid in the deck as well or tezzert the
seeker.
also this is just side note for budgets sake, YOU DONT NEED DUALLANDS. It seriously adds over 1000 dollars to the deck. Not necessary at all unless you nticipate going to tournaments and beating tier 1 edh decks. which nothing against
reaper king, as i LOVE
REAPER KING DECKS, will not do. top tier edh will make crop circles with your little crows.
This is all opinion base so some of these suggestions might not go with what you are going for. Its all just food for thought.
Sam