Sad Moldy Plateau

{t} Add either {r} or {w} to your mana pool.
Counts as both mountains and plains and is
affected by spells that affect either.
After you tap Sad Moldy Plateau for the first
time, place it in a penny sleeve, file it away, and
never play it again.
"It frequently laments its own existence, sitting
unused in a legacy or vintage deck." - Jeffrey en-Vec