The card types that can appear on cards exiled with Keen-Eyed Curator are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery
You can have a larger deck if you want, though it becomes less likely that you'll draw any given card the bigger your deck is
Yes, Monoist Circuit-Feeder needs some support, but youre bound to have at least a couple of artifacts out by the time you cast this, and it should be able to kill most things
Wonder Pick full-art starter: Bulbasaur Starting deck : Sandslash Fighting-type deck This pack is a great pick if you want to run a budget-friendly but competitive Marowak EX deck as the starting deck has a lot of the necessary cards
Theyve made a bunch of Magic the Gathering themed products which you can check out here
Depending on how well you looked after your cards in the 90s and noughties, you could be sitting on a goldmine