For actual discard this card is one of the weaker effects on the list but the combined package is so potent and versatile you just don't care
If you want to cycle through your deck to find your best cards, the way to do that isn't to play extra cards
With only one of each legend at your disposal, your opponents will only need to deal with a card once to all but remove it from the game
White gets access to Banishing Light at common, which is an all-timer removal spell as far as Im concerned
You can keep Super Shredder on the battlefield and pump it effectively with all your other ninja doings
Then theres the fact that two signpost uncommons, Arbalest Engineers and Junkyard Genius, as well as two excellent blue cards, Stern Lesson and Urza, Powerstone Prodigy, have good Powerstone synergies