On the planeswalker side, the uptick gives you card advantage, the downtick gives you a token, though its a legendary token, and the ultimate animates six lands into 6/6s
Getting two item cards from your discard pile is obviously very useful, but Darkrais Dark Pulse is no slouch, doing 30 damage for every Darkness energy attached to it
Mana Cost / Mana Value Some rules and effects care about a cards mana value as a measure of how expensive the card is
Copies can be had for just $0.10 currently, and it barely sees play even in Commander Elf decks
Im still leaning on trying out Quick Draw for myself, probably followed by Grand Larceny
It can feel inappropriate when the rest of the table dont play enough interaction, or play a slower game