Doc, Leader of the Seven Dwarfs, can you help you get your fix and seven-cost characters in play faster, or leave you extra lore to plan characters on curve and move them to your Locations
I use him more as a fine all round card that I can hedge with much more than in the role of a value card
To give your foe a basic land is indeed a downside, but a fair price to get rid of almost any threat
The fastest way to get cards in Arena is to purchase them with gems through a bundle, buy a deck in the store or straight packs and wildcards
Tarkir: Dragonstorm and Edge of Eternities also had some really powerful designs, and while they weren't my favorite Limited environments, they definitely added some great cards to Standard (honorable mention, Consult the Star Charts)
Another good vehicle for your casual decks