You draw a card and discard a card every time shes tapped, and with enough lesson cards in your graveyard, all noncreature spells cost one mana less
Unhinged has some classic, really unique looking tokens that are still worth a good bit of money (at least, by token standards) to this day, with the Squirrel token leading the way at over $3 and the rest falling into the $1.50 to $2.50 range
The sword is pretty nasty, too, giving the equipped Creature +2/+2, protection from Red and Green, allowing you to exile and play exiled cards, and play an extra land each turn
1 Battering Sliver
I do really like the idea of adventure lands, I think that's really cool, aside from the whole Town thing
More details will be available closer to the sets release