Trample allows all excess damage a creature deals to be dealt to a player, making it even easier to use abilities that trigger when this happens, while reach allows them to block creatures with flying, which can be nasty if left alone
Nothing will happen on its resolution, since nothing has been exiled with the first trigger (it hasnt even resolved yet!)
While it might not seem exciting to draw three guaranteed lands a turn, remember that this also thins your deck of land, allowing you to draw more spells than you would have otherwise
Honorable Mention 2 Bitter Revelation These are the sorts of cards that decks are built on
Mnemonic Wall Cards that can return others to your hand from the graveyard are very useful, and Mnemonic Wall does exactly that along with having a big body that is hard to get through
As we alluded to before, for instance, they can struggle to build a board as they lack Token generation