CardName: Burning Port
Cost:
Type: Land
Pow/Tgh: /
Rules Text: {T}: Add {w} or {u} to your mana pool.
Whenever you play another land, Burning Port deals 1 damage
to you.
Flavour Text:
Set/Rarity: Multiverse Design Challenge None
Burning Port
Land
: Add or to your mana pool.
Whenever you play another land, Burning Port deals 1 damage to you.
: Add 
or 
to your mana pool.
See Challenge # 157.
Probably not printable, but I was imagining a cycle of lands of cities ruined by the omniburst.
Burning Port, a dual land