Include detailed information about the cards you are selling, including: The edition
There are cards that trigger other special abilities whenever you sacrifice a land (like making extra creatures to fill up your board) and cards with various Landfall abilities that do cool things whenever you play a land (like getting an extra combat step)
(If a permanent with a stun counter would become untapped, remove one from it instead.) 4 //// Rooftop Saboteurs Creature Moonfolk Ninja 2/3 Flying Whenever Rooftop Saboteurs deals combat damage to a player or battle, draw a card
You can dump more mana into it so as to extend the delay before you have to face the problem again
Archeomancer's Map Archeomancer's Map is another card following the 'fairness' motif that's probably becoming quite familiar by now
Naturally, with its Incubate ability, the earlier you can establish it onto the battlefield, the more value you will gain over the course of the game