Once we were in Las Vegas, things were still not fully defined, but some of us ended up working on a Midrange/Combo deck based around Doomsday Excruciator and Jace, the Perfected Mind
If we ever get a Floodborn Arthur, which would be sick, then this card could be a nice Shift target for it
16 - Horn of Plenty The Horn of Plenty has some dubious food depicted on its art, and it's equally odd in gameplay, allowing players to pay 1 to draw a card whenever they cast a spell
Ability costs can include ink (paid by exerting cards in your inkwell), exerted cards (paid by, well, exerting cards) or something else explained on the card itself
If a player has a card that says instant on it, they can play that card at any point in the game, even if its not their turn