The artifact decks were often the best at this, because they brought out their mana so fast that they could shrug off losing two lands while they crippled their opponent's development, and decks with green mana creatures like Birds of Paradise often used the same plan
No, while the proliferate mechanic only hits counters on permanents , there are some options to get more time counters on cards
However, Superfriend decks have a natural disadvantage in Commander, as there are three players who can work together to get rid of any problematic planeswalker before you ever get to use them to their max potential
While the original Blood Moon has fallen out of favor (and been reprinted a lot), Harbinger has the chance to hold a solid price, although maybe not quite what it is now
Characters old and new can be seen piloting and saddling a whole host of new vehicles and mounts with new mechanics that make a player feel fast and, undoubtedly, furious