If you do, you lose life equal to its mana value
Theres almost always a new utility land in every set nowadays, so Expedition Maps value will just keep rising
It's handy for combo strategies, builds your Storm count, pumps Prowess creatures, puts an Instant into the graveyard to get you towards Delirium or enlarge a Tarmogoyf, and gets you closer to Threshold or pays for Delve costs And sometimes you would rather have cards on top of your deck than in your hand
Already, an auction for Emrakul, the World Anew 183/250 has reached a price of $1600
No offense to Jesper Myrfors and Christopher Rush (the two people who designed the Magic card back), but graphic design has come a long way since 1993, and WotC / Hasbro has a lot more resources to make the back pop in a way it currently does not
Sagas are a fascinating card type: although they're a permanent like other enchantments, they have a fixed lifespan, and they have different effects from turn to turn