It's important to keep cards that will help you add gas to your tank, so try to hold onto cards like Lucky, Pongo, Tinker Bell, Strike a Good Match, Hypnotize, and Improvize when you see them
The second reason to be excited about Lumbering Falls is hexproof
they often rely on a Feasting Troll King to beat you in combination with Trail of Crumbs
In a notable departure, there will be no Commander decks for this release
You can jump in and be playing Magic against a human opponent within a minute or so of launching the client, you can use any of several included pre-constructed decks for free, and I never had to wait more than a few seconds for a game
However, while Lightning Greaves has the advantage of no equip cost, it grants shroud, which stops you from targeting the equipped creature - which can be annoying in Commander decks built around buff spells or just running a lot of equipment cards