Sokka's lesson is particularly handy with Stormchaser's Talent, and both are common early plays in Standard blue decks
Anytime an opponent does practically anything twice, from attacking with two creatures to drawing a second card, you get to draw a card as well
Equipment cards with this ability enter the battlefield with a creature to wield them
Zul Ashur has two abilities, one is a solid ward effect, one that forces your opponent to lose two life if they want to target her with a spell or ability, which isn't too bad but pretty easy to work around
Thinning your deck, making sure you have enough mana to cast bath song, while at the same time not "wasting" your lorien revealed since you can shuffle it back is a big deal
This cards potential comes from how well it combos with other effects, making it a staple of landfall decks