CardName:
Cost: 2
Type: Artifact
Pow/Tgh: /
Rules Text: ~ enters the battlefield tapped.
When ~ enters the battlefield, add {W} to your mana pool.
{T}: Add {U} or {B} to your mana pool.
Flavour Text:
Set/Rarity: Muraganda Common
C
Artifact
~ enters the battlefield tapped.
When ~ enters the battlefield, add to your mana pool.
: Add or to your mana pool.
Even if some cards focus on basic mana, I think a little bit mana fixing besides the rare lands should be included in the set so that people who really want to play three colours can do so.
I'm just not sure if this mana stone should cost 2 or 3 mana.
Also, the Borderpost cycle of Alara would also fit into the set, although coloured artifacts are a bit weird outside of Alara.
to your mana pool.
: Add 
or 
to your mana pool.
Even if some cards focus on basic mana, I think a little bit mana fixing besides the rare lands should be included in the set so that people who really want to play three colours can do so.
I'm just not sure if this mana stone should cost 2 or 3 mana.
Also, the Borderpost cycle of Alara would also fit into the set, although coloured artifacts are a bit weird outside of Alara.