The most used modes chosen in Commander are likely to be drawing two cards and dealing five damage to target creature, though the artifact destruction is also a nifty option if one of your opponents has a particularly annoying trinket on the board
Llanowar Elves has recently sold out of every copy under $700, so while it had a dip at one point, the trend is clear and its not like anyone is mass-cracking Foundations at this point
Tutors in MTG can be used to improve your card selection
Prowling Geistcatcher Four mana really is the new six mana, at least when it comes to black
The card advantage is good, and you can squeeze a lot from the -1 ability: four pseudo-vigilant creatures or a burst of mana
He's outstanding in Commander, and has plenty of uses in Cubes as well, making for a really well-rounded planeswalker that never feels too op-pressive to play against