Reach for the Sky for me is a bit too expensive, the effect is powerful and will certainly generate blow out scenarios, but the downside of a 4 mana combat trick is that if your opponent has instant speed removal, you are in trouble and often end up with bad trades
Tables vary in texture and cleanliness, which affects card handling
WotC prints cards that make everyone discard on a regular basis, and theres always a new commander that gives a new spin on this theme
Challenge diverse AI opponents
If you dropped Bramblem Familiar earlier in the game to help smooth out your mana a bit, you can always discard a card to bounce it back to your hand, giving you an opportunity to cast Fetch Quest again
Chandra, Acolyte of Flame may be small, but she earns her keep in an aggressive deck