See Challenge # 128.

"Thir is a nation of farmers and growers ... Thirans gladly share with each other when it's a matter of survival, but their traders know when they have a monopoly, and they utilize that knowledge without hesitation."

Not sure of cost/number combination here. I want to make it fairly attractive, but not risk tempting players to mana-screw themselves or get stronger than existing draw spells.

Considering this is much weaker than Careful Study, I'd suggest upping the number of lands you can discard. It probably belongs in uncommon, though. New players should have limited exposure to the mechanic.

Come to think of it, this may not be green either... It could be "discard 3" at uncommon. Or maybe be "discard 1, draw 2" at common?

This seems more red or blue than it does green, despite the focus on lands.