Lets be real, balancing one card is going to be tricky, two almost impossible while still playing the game, three, forget about it
And then the uncommon artifact is a 2-drop that will stop non-lands from arriving to the battlefield from libraries and graveyards and I don't have anything this would care about
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature
Weatherlight Four mana, 4/5 flyer and when it punches face you dig down 5 cards and draw a historic card (artifacts, sagas, legendaries)
Entomb Suggested Cut : Subjugate the Hobbits I want to lower the decks overall curve
Spinneret and Spiderling doesn't have to be one of the two or more Spiders you attack with in order to cause their first ability to trigger