­Jace's Archivist + Dusty Desert

Ditch all cards, everyone draws a lot of cards.

And a land that starts bad but can be upgraded (by, basically, playing more cards from that same set) into a good one.

So maybe an upgradable draw? Or something that gains mana from all players?

Everyone gaining mana is nicely risky - it's usually best for you, since you need it and everyone else is maybe unready for it - but maybe they can do something evil.

Creature or land? Or maybe something else? A counterspell would work perhaps? ... why do I keep wanting to give blue mana making abilities? Oooh, could do this in red though, as a choice card.

And now it's lost the 'all players' part. Which probably works better anyway. Look at me R&D, I made a junk rare!