Trading strategically can be more valuable than constant pack buying
(It's an artifact with "2, T, Sacrifice this artifact: You gain 3 life.") +1: Target artifact or creature loses all abilities and becomes a green Elk creature with base power and toughness 3/3
If its a cheap card, your chances of a 10 are much greater than dealing with a high-end card (trust me on this point)
And, of course, Doubling Season
Similarly, off-center cuts where the card's borders are dramatically uneven, showing much more of one edge than the other, or in extreme cases revealing portions of adjacent cards on the uncut sheet, can command significant premiums
It has Sapphires signature ramp cards like 001-164-one-jump-ahead, letting you increase your inkwell and play more expensive cards