An unpowered fair Legacy cube, originally designed to be as cheap as a board game. Some cards have gone up in price and I haven't been too much of a stickler about replacing them, and I've added more lands, so it's a little more pricey than it was, but I'm committed to keeping the nonland around $100. If you want to get it under 100, you could do so pretty easily without compromising the integrity of the cube at all by replacing the planeswakers that are more than 2 dollars. You could also lower the curve a bit by replacing all the walkers and then replacing all the removal that is teched for PWs with 1- and 2-mana removal effects that are not in the cube yet.

The gameplay itself is low to ground and decision intensive -- there are few swingy cards costing 5+ mana, and the interaction is designed to be mostly cheap where possible but still able to take down a planeswalker. This results in a format where you have to play to the board quickly, but you should have the tools to do so. Games get grindy as a result, much like mirrors between highly interactive aggro decks if you have played any of those.

Speaking of swinginess, as a design philosophy I aim to include only cards with a high floor. Cards like Comet Storm and Legacy’s Allure have come out because they range from horrible garbage to completely game winning and I prefer more consistent cards. Cards are allowed to have high ceilings, but they should have fairly high floors as well.

A note on lands: how you want to handle fixing, whether to break singleton on it, etc. is up to you. Personally, I find good lands to be the hardest thing to go budget on. The rest of the cube I honestly wouldn’t even change much. I am presently cubing this list, plus a 4x shock / 2x check / 5x vista mana base. If you want budget lands, I highly recommend checks, pains, and creature lands. Untapped fixing is king in an environment this low to the ground, and creature lands are hard to remove threats as well as lands.