Of the two, I believe MID had a better draft environment than VOW so maybe their set codes should be the other way around
MR: The color pie is robust enough that we have the ability to show heroism and villainy in all five colors
Voltaic Key Voltaic Key is a great artifact untapper
Tapping down 5 lands for 5 turns in a row to win with a Colonnade is a fairly common route to victory for conrtol decks already and that is a lot of turns without access to that much mana where things can go pear shaped for you
The other option is to take advantage of the direct damage, which is good in its own right to either finish off a damaged character or get them within range to be banished but also works with the likes of cards that benefit from being damaged - such as Scroop, Backstabber - that benefit from healing damage, like Rapunzel, Gifted Artist, or from damage being dealt: like Beast, Relentless.
Lets take a look at the new decks and what makes them special and fun