These will usually be the land and creature cards you used on or since your last turn
You want to play your commander as soon as possible, regardless of having ways to protect it
While it can be argued that a card like Eternal Witness will often work better in some decks than Snapcaster Mage, you cant use that card to give something like Mana Drain flashback at instant speed to stop a key threat and keep you in the game
It takes time to work, which is a tough sell in modern Magic, but when you get that value, it rocks
With haste and flying as well, it can enter the battlefield and deal direct damage very quickly
8 Overlord Of The Hauntwoods Even More Lands The Overlord might not be a land like the first two entries here, but it makes one, so is it really that different